fix(scanner): report active first-cycle status (#5397)

* fix(scanner): report active first-cycle status

* fix(scanner): publish cycle activity consistently

* test(common): satisfy Rust 1.97 waker lint

* fix(scanner): satisfy Rust 1.97 clippy

---------

Co-authored-by: houseme <housemecn@gmail.com>

crates/common/src/metrics.rs

@@ -1114,6 +1114,8 @@ pub struct ScannerLastMinute {
 pub struct ScannerMetricsReport {
     pub collected_at: DateTime<Utc>,
     pub current_cycle: u64,
+    #[serde(default)]
+    pub current_cycle_active: bool,
     pub current_started: DateTime<Utc>,
     pub cycles_completed_at: Vec<DateTime<Utc>>,
     pub ongoing_buckets: usize,
@@ -2051,7 +2053,7 @@ impl Metrics {
     pub fn record_scanner_transition_failed(&self, count: u64) {
         self.scanner_transition_failed.fetch_add(count, Ordering::Relaxed);
         self.record_scanner_source_failed(ScannerWorkSource::Lifecycle, count);
-        if !self.current_scan_cycle_work_active.load(Ordering::Relaxed) {
+        if !self.current_scan_cycle_work_active.load(Ordering::Acquire) {
             self.record_last_cycle_scanner_source_work(ScannerWorkSource::Lifecycle, ScannerSourceWorkUpdate::failed(count));
         }
     }
@@ -2336,6 +2338,21 @@ impl Metrics {
         *self.cycle_info.write().await = cycle;
     }
 
+    /// Publish a scanner cycle and its work-accounting baseline as one state transition.
+    pub async fn start_scan_cycle_work_with_cycle(&self, cycle: CurrentCycle) -> ScanCycleWorkSnapshot {
+        let mut current_cycle = self.cycle_info.write().await;
+        let snapshot = self.start_scan_cycle_work();
+        *current_cycle = Some(cycle);
+        snapshot
+    }
+
+    /// Publish the completed work snapshot and idle cycle state as one state transition.
+    pub async fn finish_scan_cycle_work_with_cycle(&self, start: ScanCycleWorkSnapshot, cycle: CurrentCycle) {
+        let mut current_cycle = self.cycle_info.write().await;
+        self.finish_scan_cycle_work(start);
+        *current_cycle = Some(cycle);
+    }
+
     /// Read the current cycle record.
     pub async fn get_cycle(&self) -> Option<CurrentCycle> {
         self.cycle_info.read().await.clone()
@@ -2464,7 +2481,7 @@ impl Metrics {
             &self.current_scan_cycle_replication_repair_work_start,
             &replication_repair_snapshot,
         );
-        self.current_scan_cycle_work_active.store(true, Ordering::Relaxed);
+        self.current_scan_cycle_work_active.store(true, Ordering::Release);
         snapshot
     }
 
@@ -2476,11 +2493,11 @@ impl Metrics {
         self.record_scan_cycle_work(work);
         self.record_scan_cycle_source_work(&source_work);
         self.record_scan_cycle_replication_repair_work(&replication_repair_work);
-        self.current_scan_cycle_work_active.store(false, Ordering::Relaxed);
+        self.current_scan_cycle_work_active.store(false, Ordering::Release);
     }
 
     pub fn current_scan_cycle_has_unresolved_heal_work(&self) -> bool {
-        if !self.current_scan_cycle_work_active.load(Ordering::Relaxed) {
+        if !self.current_scan_cycle_work_active.load(Ordering::Acquire) {
             return false;
         }
 
@@ -2746,13 +2763,41 @@ impl Metrics {
     pub async fn report(&self) -> ScannerMetricsReport {
         let mut m = ScannerMetricsReport::default();
 
-        let has_cycle = if let Some(cycle) = self.get_cycle().await {
+        let has_cycle = {
-            m.current_cycle = cycle.current;
+            let cycle = self.cycle_info.read().await;
-            m.cycles_completed_at = cycle.cycle_completed;
+            let has_cycle = if let Some(cycle) = cycle.as_ref() {
-            m.current_started = cycle.started;
+                m.current_cycle = cycle.current;
-            true
+                m.cycles_completed_at = cycle.cycle_completed.clone();
-        } else {
+                m.current_started = cycle.started;
-            false
+                true
+            } else {
+                false
+            };
+            m.current_cycle_active = self.current_scan_cycle_work_active.load(Ordering::Acquire);
+            if m.current_cycle_active {
+                let current_work = self.scan_cycle_work_since(self.current_scan_cycle_work_start());
+                let current_source_work = self.scanner_source_work_since(&self.current_scan_cycle_source_work_start_values());
+                let current_replication_repair_work =
+                    self.scanner_replication_repair_work_since(&self.current_scan_cycle_replication_repair_work_start_values());
+                m.current_cycle_objects_scanned = current_work.objects_scanned;
+                m.current_cycle_directories_scanned = current_work.directories_scanned;
+                m.current_cycle_bucket_drive_scans = current_work.bucket_drive_scans;
+                m.current_cycle_bucket_drive_failures = current_work.bucket_drive_failures;
+                m.current_cycle_yield_events = current_work.yield_events;
+                m.current_cycle_yield_duration_seconds = current_work.yield_duration_millis as f64 / 1000.0;
+                m.current_cycle_throttle_sleep_events = current_work.throttle_sleep_events;
+                m.current_cycle_throttle_sleep_duration_seconds = current_work.throttle_sleep_duration_millis as f64 / 1000.0;
+                m.current_cycle_ilm_actions = current_work.ilm_actions;
+                m.current_cycle_lifecycle_expiry_actions = current_work.lifecycle_expiry_actions;
+                m.current_cycle_lifecycle_transition_actions = current_work.lifecycle_transition_actions;
+                m.current_cycle_heal_objects = current_work.heal_objects;
+                m.current_cycle_replication_checks = current_work.replication_checks;
+                m.current_cycle_usage_saves = current_work.usage_saves;
+                m.current_cycle_source_work = self.scanner_source_work_snapshots(&current_source_work);
+                m.current_cycle_replication_repair =
+                    self.scanner_replication_repair_work_snapshots(&current_replication_repair_work);
+            }
+            has_cycle
         };
 
         if !has_cycle && let Some(init_time) = crate::get_global_init_time().await {
@@ -2793,28 +2838,6 @@ impl Metrics {
         m.current_disk_scan_concurrency_limit = disk_scan_concurrency_limit;
         m.current_disk_bucket_scans_queued = disk_bucket_scans_queued;
         m.current_disk_bucket_scans_active = disk_bucket_scans_active;
-        if self.current_scan_cycle_work_active.load(Ordering::Relaxed) {
-            let current_work = self.scan_cycle_work_since(self.current_scan_cycle_work_start());
-            let current_source_work = self.scanner_source_work_since(&self.current_scan_cycle_source_work_start_values());
-            let current_replication_repair_work =
-                self.scanner_replication_repair_work_since(&self.current_scan_cycle_replication_repair_work_start_values());
-            m.current_cycle_objects_scanned = current_work.objects_scanned;
-            m.current_cycle_directories_scanned = current_work.directories_scanned;
-            m.current_cycle_bucket_drive_scans = current_work.bucket_drive_scans;
-            m.current_cycle_bucket_drive_failures = current_work.bucket_drive_failures;
-            m.current_cycle_yield_events = current_work.yield_events;
-            m.current_cycle_yield_duration_seconds = current_work.yield_duration_millis as f64 / 1000.0;
-            m.current_cycle_throttle_sleep_events = current_work.throttle_sleep_events;
-            m.current_cycle_throttle_sleep_duration_seconds = current_work.throttle_sleep_duration_millis as f64 / 1000.0;
-            m.current_cycle_ilm_actions = current_work.ilm_actions;
-            m.current_cycle_lifecycle_expiry_actions = current_work.lifecycle_expiry_actions;
-            m.current_cycle_lifecycle_transition_actions = current_work.lifecycle_transition_actions;
-            m.current_cycle_heal_objects = current_work.heal_objects;
-            m.current_cycle_replication_checks = current_work.replication_checks;
-            m.current_cycle_usage_saves = current_work.usage_saves;
-            m.current_cycle_source_work = self.scanner_source_work_snapshots(&current_source_work);
-            m.current_cycle_replication_repair = self.scanner_replication_repair_work_snapshots(&current_replication_repair_work);
-        }
         let last_cycle_result = self.last_scan_cycle_result.load(Ordering::Relaxed);
         m.last_cycle_result = scan_cycle_result_label(last_cycle_result).to_string();
         m.last_cycle_result_code = last_cycle_result as u64;
@@ -4142,6 +4165,8 @@ mod tests {
 
         let report = metrics.report().await;
 
+        assert!(report.current_cycle_active);
+        assert_eq!(report.current_cycle, 0);
         assert_eq!(report.current_cycle_objects_scanned, 7);
         assert_eq!(report.current_cycle_directories_scanned, 3);
         assert_eq!(report.current_cycle_bucket_drive_scans, 2);
@@ -4158,6 +4183,8 @@ mod tests {
         metrics.finish_scan_cycle_work(start);
         let report = metrics.report().await;
 
+        assert!(!report.current_cycle_active);
+        assert_eq!(report.current_cycle, 0);
         assert_eq!(report.current_cycle_objects_scanned, 0);
         assert_eq!(report.current_cycle_directories_scanned, 0);
         assert_eq!(report.current_cycle_bucket_drive_scans, 0);
@@ -4184,6 +4211,91 @@ mod tests {
         assert_eq!(report.last_cycle_usage_saves, 2);
     }
 
+    #[tokio::test]
+    async fn scan_cycle_activity_and_cycle_state_publish_together() {
+        let metrics = Metrics::new();
+        let cycle_started = Utc::now() - chrono::Duration::seconds(5);
+        let active_cycle = CurrentCycle {
+            current: 12,
+            next: 13,
+            started: cycle_started,
+            ..Default::default()
+        };
+
+        let cycle_state = metrics.cycle_info.read().await;
+        let mut start_transition = Box::pin(metrics.start_scan_cycle_work_with_cycle(active_cycle));
+        let waker = std::task::Waker::noop();
+        let mut context = std::task::Context::from_waker(waker);
+        assert!(start_transition.as_mut().poll(&mut context).is_pending());
+        assert!(!metrics.current_scan_cycle_work_active.load(Ordering::Acquire));
+        drop(cycle_state);
+
+        let start = start_transition.await;
+        let active = metrics.report().await;
+        assert!(active.current_cycle_active);
+        assert_eq!(active.current_cycle, 12);
+        assert_eq!(active.current_started, cycle_started);
+
+        let idle_cycle = CurrentCycle {
+            current: 0,
+            next: 13,
+            started: cycle_started,
+            ..Default::default()
+        };
+        let cycle_state = metrics.cycle_info.read().await;
+        let mut finish_transition = Box::pin(metrics.finish_scan_cycle_work_with_cycle(start, idle_cycle));
+        assert!(finish_transition.as_mut().poll(&mut context).is_pending());
+        assert!(metrics.current_scan_cycle_work_active.load(Ordering::Acquire));
+        drop(cycle_state);
+
+        finish_transition.await;
+        let idle = metrics.report().await;
+        assert!(!idle.current_cycle_active);
+        assert_eq!(idle.current_cycle, 0);
+    }
+
+    #[tokio::test]
+    async fn report_keeps_cycle_identity_and_work_in_one_snapshot() {
+        let metrics = Metrics::new();
+        let cycle_ten = CurrentCycle {
+            current: 10,
+            next: 11,
+            started: Utc::now() - chrono::Duration::seconds(10),
+            ..Default::default()
+        };
+        let cycle_ten_start = metrics.start_scan_cycle_work_with_cycle(cycle_ten.clone()).await;
+        metrics.operations[Metric::ScanObject as usize].store(1, Ordering::Relaxed);
+
+        let paths = metrics.current_paths.write().await;
+        let mut report = Box::pin(metrics.report());
+        let waker = std::task::Waker::noop();
+        let mut context = std::task::Context::from_waker(waker);
+        assert!(report.as_mut().poll(&mut context).is_pending());
+
+        metrics
+            .finish_scan_cycle_work_with_cycle(cycle_ten_start, CurrentCycle { current: 0, ..cycle_ten })
+            .await;
+        let cycle_eleven_start = metrics
+            .start_scan_cycle_work_with_cycle(CurrentCycle {
+                current: 11,
+                next: 12,
+                started: Utc::now(),
+                ..Default::default()
+            })
+            .await;
+        metrics.operations[Metric::ScanObject as usize].store(101, Ordering::Relaxed);
+
+        drop(paths);
+        let snapshot = report.await;
+
+        assert_eq!(snapshot.current_cycle, 10);
+        assert_eq!(snapshot.current_cycle_objects_scanned, 1);
+
+        metrics
+            .finish_scan_cycle_work_with_cycle(cycle_eleven_start, CurrentCycle::default())
+            .await;
+    }
+
     #[tokio::test]
     async fn scanner_cycle_ilm_actions_ignore_global_ilm_work() {
         let metrics = Metrics::new();

crates/ecstore/src/runtime/sources.rs

@@ -207,10 +207,6 @@ pub(crate) async fn ensure_boot_time() {
     GLOBAL_BOOT_TIME.get_or_init(|| async { SystemTime::now() }).await;
 }
 
-pub(crate) async fn scanner_init_time() -> Option<chrono::DateTime<chrono::Utc>> {
-    rustfs_common::get_global_init_time().await
-}
-
 pub(crate) async fn root_disk_threshold_for_erasure_disk() -> Option<u64> {
     if is_erasure_sd().await {
         None

crates/ecstore/src/services/metrics_realtime.rs

@@ -71,6 +71,7 @@ fn to_madmin_scanner_metrics(metrics: rustfs_common::metrics::ScannerMetricsRepo
     MadminScannerMetrics {
         collected_at: metrics.collected_at,
         current_cycle: metrics.current_cycle,
+        current_cycle_active: Some(metrics.current_cycle_active),
         current_started: metrics.current_started,
         cycles_completed_at: metrics.cycles_completed_at,
         ongoing_buckets: metrics.ongoing_buckets,
@@ -398,10 +399,7 @@ pub async fn collect_local_metrics(types: MetricType, opts: &CollectMetricsOpts)
 
     if types.contains(&MetricType::SCANNER) {
         debug!("start get scanner metrics");
-        let mut metrics = global_metrics().report().await;
+        let metrics = global_metrics().report().await;
-        if let Some(init_time) = runtime_sources::scanner_init_time().await {
-            metrics.current_started = init_time;
-        }
         real_time_metrics.aggregated.scanner = Some(to_madmin_scanner_metrics(metrics));
     }
 
@@ -540,7 +538,9 @@ async fn collect_local_disks_metrics(disks: &HashSet<String>) -> HashMap<String,
 #[cfg(test)]
 mod test {
     use super::*;
+    use rustfs_common::metrics::CurrentCycle;
     use rustfs_io_metrics::internode_metrics::global_internode_metrics;
+    use serial_test::serial;
     use std::time::Duration;
 
     #[test]
@@ -588,7 +588,10 @@ mod test {
 
     #[test]
     fn scanner_metrics_mapping_preserves_partial_source_status() {
+        let current_started = Utc::now() - chrono::Duration::seconds(5);
         let scanner = to_madmin_scanner_metrics(rustfs_common::metrics::ScannerMetricsReport {
+            current_cycle_active: true,
+            current_started,
             last_cycle_partial_source: "usage".to_string(),
             last_cycle_partial_source_code: 1,
             partial_cycles_by_source: vec![rustfs_common::metrics::ScannerSourceCycleSnapshot {
@@ -598,6 +601,8 @@ mod test {
             ..Default::default()
         });
 
+        assert_eq!(scanner.current_cycle_active, Some(true));
+        assert_eq!(scanner.current_started, current_started);
         assert_eq!(scanner.last_cycle_partial_source, "usage");
         assert_eq!(scanner.last_cycle_partial_source_code, 1);
         let usage = scanner
@@ -608,6 +613,39 @@ mod test {
         assert_eq!(usage.cycles, 2);
     }
 
+    #[tokio::test]
+    #[serial]
+    async fn collect_local_metrics_preserves_scanner_cycle_started_time() {
+        let previous_init_time = *rustfs_common::globals::GLOBAL_INIT_TIME.read().await;
+        let previous_cycle = global_metrics().get_cycle().await;
+        let init_time = Utc::now() - chrono::Duration::hours(1);
+        let cycle_started = Utc::now() - chrono::Duration::seconds(5);
+        *rustfs_common::globals::GLOBAL_INIT_TIME.write().await = Some(init_time);
+        let cycle = CurrentCycle {
+            current: 0,
+            next: 1,
+            started: cycle_started,
+            ..Default::default()
+        };
+        let cycle_start = global_metrics().start_scan_cycle_work_with_cycle(cycle).await;
+
+        let realtime = collect_local_metrics(MetricType::SCANNER, &CollectMetricsOpts::default()).await;
+
+        global_metrics()
+            .finish_scan_cycle_work_with_cycle(cycle_start, previous_cycle.clone().unwrap_or_default())
+            .await;
+        global_metrics().set_cycle(previous_cycle).await;
+        *rustfs_common::globals::GLOBAL_INIT_TIME.write().await = previous_init_time;
+
+        let encoded = rmp_serde::to_vec_named(&realtime).expect("realtime metrics should encode");
+        let decoded: RealtimeMetrics = rmp_serde::from_slice(&encoded).expect("realtime metrics should decode");
+        let mut aggregated = RealtimeMetrics::default();
+        aggregated.merge(decoded);
+        let scanner = aggregated.aggregated.scanner.expect("scanner metrics");
+        assert_eq!(scanner.current_cycle_active, Some(true));
+        assert_eq!(scanner.current_started, cycle_started);
+    }
+
     #[test]
     fn scanner_metrics_mapping_preserves_pacing_pressure() {
         let scanner = to_madmin_scanner_metrics(rustfs_common::metrics::ScannerMetricsReport {

crates/madmin/src/metrics.rs

@@ -545,6 +545,8 @@ pub struct ScannerMetrics {
     pub collected_at: DateTime<Utc>,
     #[serde(rename = "current_cycle")]
     pub current_cycle: u64,
+    #[serde(rename = "current_cycle_active", default, skip_serializing_if = "Option::is_none")]
+    pub current_cycle_active: Option<bool>,
     #[serde(rename = "current_started")]
     pub current_started: DateTime<Utc>,
     #[serde(rename = "cycle_complete_times")]
@@ -718,7 +720,31 @@ pub struct ScannerMetrics {
 }
 
 impl ScannerMetrics {
+    pub fn is_current_cycle_active(&self) -> bool {
+        self.current_cycle_active.unwrap_or(self.current_cycle > 0)
+    }
+
     pub fn merge(&mut self, other: &Self) {
+        // Legacy nodes omit the activity field and use a non-zero cycle as
+        // their active signal. New nodes publish explicit first-cycle and idle
+        // states, including cycle zero.
+        let self_cycle_active = self.is_current_cycle_active();
+        let other_cycle_active = other.is_current_cycle_active();
+        let self_cycle_authority = (
+            self_cycle_active,
+            self.current_cycle,
+            self.cycles_completed_at.len(),
+            self.cycles_completed_at.as_slice(),
+            self.current_started,
+        );
+        let other_cycle_authority = (
+            other_cycle_active,
+            other.current_cycle,
+            other.cycles_completed_at.len(),
+            other.cycles_completed_at.as_slice(),
+            other.current_started,
+        );
+        let other_cycle_is_authoritative = self_cycle_authority < other_cycle_authority;
         let other_is_newer = self.collected_at < other.collected_at;
         if other_is_newer {
             self.collected_at = other.collected_at;
@@ -854,15 +880,12 @@ impl ScannerMetrics {
             self.ongoing_buckets = other.ongoing_buckets;
         }
 
-        if self.current_cycle < other.current_cycle {
+        if other_cycle_is_authoritative {
             self.current_cycle = other.current_cycle;
             self.cycles_completed_at = other.cycles_completed_at.clone();
             self.current_started = other.current_started;
         }
-
+        self.current_cycle_active = Some(self_cycle_active || other_cycle_active);
-        if other.cycles_completed_at.len() > self.cycles_completed_at.len() {
-            self.cycles_completed_at = other.cycles_completed_at.clone();
-        }
 
         if !other.life_time_ops.is_empty() && self.life_time_ops.is_empty() {
             self.life_time_ops = other.life_time_ops.clone();
@@ -931,7 +954,13 @@ impl Metrics {
         if let Some(scanner) = other.scanner.as_ref() {
             match self.scanner {
                 Some(ref mut s_scanner) => s_scanner.merge(scanner),
-                None => self.scanner = Some(scanner.clone()),
+                None => {
+                    let mut scanner = scanner.clone();
+                    if scanner.current_cycle_active.is_none() {
+                        scanner.current_cycle_active = Some(scanner.is_current_cycle_active());
+                    }
+                    self.scanner = Some(scanner);
+                }
             }
         }
 
@@ -1389,6 +1418,280 @@ pub struct Operations {
 mod tests {
     use super::*;
 
+    #[test]
+    fn scanner_metrics_serializes_cycle_active_presence() {
+        let missing_value = serde_json::to_value(ScannerMetrics::default()).expect("scanner metrics should serialize");
+        assert!(missing_value.get("current_cycle_active").is_none());
+        let missing: ScannerMetrics =
+            serde_json::from_value(missing_value).expect("older scanner metrics without cycle-active should decode");
+        assert_eq!(missing.current_cycle_active, None);
+
+        let explicit_false_value = serde_json::to_value(ScannerMetrics {
+            current_cycle_active: Some(false),
+            ..Default::default()
+        })
+        .expect("scanner metrics with explicit cycle-active should serialize");
+        assert_eq!(explicit_false_value["current_cycle_active"], serde_json::Value::Bool(false));
+        let explicit_false: ScannerMetrics =
+            serde_json::from_value(explicit_false_value).expect("explicit cycle-active should decode");
+        assert_eq!(explicit_false.current_cycle_active, Some(false));
+    }
+
+    #[test]
+    fn scanner_metrics_merge_prefers_an_active_first_cycle() {
+        let collected_at = Utc::now();
+        let idle_started = collected_at - chrono::Duration::hours(1);
+        let active_started = collected_at - chrono::Duration::seconds(5);
+        let mut scanner = ScannerMetrics {
+            collected_at,
+            current_cycle: 0,
+            current_cycle_active: Some(false),
+            current_started: idle_started,
+            ..Default::default()
+        };
+
+        scanner.merge(&ScannerMetrics {
+            collected_at: collected_at + chrono::Duration::seconds(1),
+            current_cycle: 0,
+            current_cycle_active: Some(true),
+            current_started: active_started,
+            ..Default::default()
+        });
+
+        assert_eq!(scanner.current_cycle_active, Some(true));
+        assert_eq!(scanner.current_cycle, 0);
+        assert_eq!(scanner.current_started, active_started);
+    }
+
+    #[test]
+    fn metrics_merge_preserves_explicit_active_first_cycle() {
+        let mut aggregated = Metrics::default();
+        aggregated.merge(&Metrics {
+            scanner: Some(ScannerMetrics {
+                current_cycle_active: Some(true),
+                ..Default::default()
+            }),
+            ..Default::default()
+        });
+
+        let scanner = aggregated.scanner.expect("aggregated scanner metrics");
+        assert_eq!(scanner.current_cycle_active, Some(true));
+        assert_eq!(scanner.current_cycle, 0);
+    }
+
+    #[test]
+    fn scanner_metrics_merge_preserves_legacy_nonzero_active_signal() {
+        let collected_at = Utc::now();
+        let mut scanner = ScannerMetrics {
+            collected_at,
+            ..Default::default()
+        };
+
+        scanner.merge(&ScannerMetrics {
+            collected_at: collected_at + chrono::Duration::seconds(1),
+            current_cycle: 7,
+            ..Default::default()
+        });
+
+        assert_eq!(scanner.current_cycle_active, Some(true));
+        assert_eq!(scanner.current_cycle, 7);
+    }
+
+    #[test]
+    fn metrics_merge_normalizes_first_legacy_scanner_snapshot() {
+        let legacy = Metrics {
+            scanner: Some(ScannerMetrics {
+                current_cycle: 7,
+                ..Default::default()
+            }),
+            ..Default::default()
+        };
+        let mut aggregated = Metrics::default();
+
+        aggregated.merge(&legacy);
+
+        let scanner = aggregated.scanner.expect("aggregated scanner metrics");
+        assert_eq!(scanner.current_cycle_active, Some(true));
+        assert_eq!(scanner.current_cycle, 7);
+    }
+
+    #[test]
+    fn scanner_metrics_merge_preserves_explicit_inactive_nonzero_cycle() {
+        let collected_at = Utc::now();
+        let mut scanner = ScannerMetrics::default();
+
+        scanner.merge(&ScannerMetrics {
+            collected_at,
+            current_cycle: 7,
+            current_cycle_active: Some(false),
+            ..Default::default()
+        });
+
+        assert_eq!(scanner.current_cycle_active, Some(false));
+        assert_eq!(scanner.current_cycle, 7);
+    }
+
+    #[test]
+    fn scanner_metrics_merge_cycle_active_is_order_independent() {
+        let collected_at = Utc::now();
+        let legacy_active = ScannerMetrics {
+            collected_at,
+            current_cycle: 7,
+            current_started: collected_at - chrono::Duration::seconds(10),
+            ..Default::default()
+        };
+        let explicit_idle = ScannerMetrics {
+            collected_at,
+            current_cycle: 0,
+            current_cycle_active: Some(false),
+            current_started: collected_at - chrono::Duration::hours(1),
+            ..Default::default()
+        };
+
+        let mut legacy_first = legacy_active.clone();
+        legacy_first.merge(&explicit_idle);
+        let mut legacy_second = explicit_idle.clone();
+        legacy_second.merge(&legacy_active);
+        assert_eq!(legacy_first.current_cycle_active, Some(true));
+        assert_eq!(legacy_second.current_cycle_active, Some(true));
+        assert_eq!(legacy_first.current_cycle, 7);
+        assert_eq!(legacy_second.current_cycle, 7);
+
+        let explicit_inactive_nonzero = ScannerMetrics {
+            collected_at,
+            current_cycle: 7,
+            current_cycle_active: Some(false),
+            ..Default::default()
+        };
+        let mut inactive_first = explicit_inactive_nonzero.clone();
+        inactive_first.merge(&explicit_idle);
+        let mut inactive_second = explicit_idle;
+        inactive_second.merge(&explicit_inactive_nonzero);
+        assert_eq!(inactive_first.current_cycle_active, Some(false));
+        assert_eq!(inactive_second.current_cycle_active, Some(false));
+        assert_eq!(inactive_first.current_cycle, 7);
+        assert_eq!(inactive_second.current_cycle, 7);
+    }
+
+    #[test]
+    fn scanner_metrics_merge_cycle_authority_is_order_independent() {
+        let collected_at = Utc::now();
+        let completion = collected_at - chrono::Duration::minutes(1);
+        let earlier_active = ScannerMetrics {
+            collected_at,
+            current_cycle: 7,
+            current_cycle_active: Some(true),
+            current_started: collected_at - chrono::Duration::seconds(10),
+            cycles_completed_at: vec![completion],
+            ..Default::default()
+        };
+        let later_active = ScannerMetrics {
+            collected_at: collected_at + chrono::Duration::seconds(1),
+            current_cycle: 7,
+            current_cycle_active: Some(true),
+            current_started: collected_at - chrono::Duration::seconds(5),
+            cycles_completed_at: vec![completion],
+            ..Default::default()
+        };
+
+        let mut earlier_first = earlier_active.clone();
+        earlier_first.merge(&later_active);
+        let mut later_first = later_active.clone();
+        later_first.merge(&earlier_active);
+
+        assert_eq!(earlier_first.current_started, later_active.current_started);
+        assert_eq!(later_first.current_started, later_active.current_started);
+        assert_eq!(earlier_first.cycles_completed_at, later_active.cycles_completed_at);
+        assert_eq!(later_first.cycles_completed_at, later_active.cycles_completed_at);
+
+        let stale_idle = ScannerMetrics {
+            collected_at,
+            current_cycle_active: Some(false),
+            current_started: collected_at - chrono::Duration::hours(1),
+            ..Default::default()
+        };
+        let completed_idle = ScannerMetrics {
+            collected_at: collected_at + chrono::Duration::seconds(1),
+            current_cycle_active: Some(false),
+            current_started: collected_at - chrono::Duration::seconds(5),
+            cycles_completed_at: vec![completion],
+            ..Default::default()
+        };
+
+        let mut stale_first = stale_idle.clone();
+        stale_first.merge(&completed_idle);
+        let mut completed_first = completed_idle.clone();
+        completed_first.merge(&stale_idle);
+
+        assert_eq!(stale_first.current_started, completed_idle.current_started);
+        assert_eq!(completed_first.current_started, completed_idle.current_started);
+        assert_eq!(stale_first.cycles_completed_at, completed_idle.cycles_completed_at);
+        assert_eq!(completed_first.cycles_completed_at, completed_idle.cycles_completed_at);
+    }
+
+    #[test]
+    fn scanner_metrics_merge_cycle_authority_is_associative() {
+        let collected_at = Utc::now();
+        let older_completion = collected_at - chrono::Duration::minutes(3);
+        let last_completion = collected_at - chrono::Duration::minutes(1);
+        let cycle_seven = ScannerMetrics {
+            collected_at,
+            current_cycle: 7,
+            current_cycle_active: Some(true),
+            current_started: collected_at - chrono::Duration::seconds(10),
+            cycles_completed_at: vec![older_completion, last_completion],
+            ..Default::default()
+        };
+        let cycle_eight = ScannerMetrics {
+            collected_at: collected_at + chrono::Duration::seconds(1),
+            current_cycle: 8,
+            current_cycle_active: Some(true),
+            current_started: collected_at - chrono::Duration::seconds(5),
+            cycles_completed_at: vec![last_completion],
+            ..Default::default()
+        };
+        let newer_idle = ScannerMetrics {
+            collected_at: collected_at + chrono::Duration::hours(1),
+            current_cycle_active: Some(false),
+            current_started: collected_at - chrono::Duration::hours(1),
+            ..Default::default()
+        };
+
+        let mut left_associative = cycle_seven.clone();
+        left_associative.merge(&cycle_eight);
+        left_associative.merge(&newer_idle);
+
+        let mut right_group = cycle_eight.clone();
+        right_group.merge(&newer_idle);
+        let mut right_associative = cycle_seven.clone();
+        right_associative.merge(&right_group);
+
+        assert_eq!(left_associative.current_cycle, 8);
+        assert_eq!(right_associative.current_cycle, 8);
+        assert_eq!(left_associative.current_started, cycle_eight.current_started);
+        assert_eq!(right_associative.current_started, cycle_eight.current_started);
+        assert_eq!(left_associative.cycles_completed_at, cycle_eight.cycles_completed_at);
+        assert_eq!(right_associative.cycles_completed_at, cycle_eight.cycles_completed_at);
+
+        for order in [
+            [&cycle_seven, &cycle_eight, &newer_idle],
+            [&cycle_seven, &newer_idle, &cycle_eight],
+            [&cycle_eight, &cycle_seven, &newer_idle],
+            [&cycle_eight, &newer_idle, &cycle_seven],
+            [&newer_idle, &cycle_seven, &cycle_eight],
+            [&newer_idle, &cycle_eight, &cycle_seven],
+        ] {
+            let mut merged = ScannerMetrics::default();
+            for scanner in order {
+                merged.merge(scanner);
+            }
+            assert_eq!(merged.current_cycle_active, Some(true));
+            assert_eq!(merged.current_cycle, 8);
+            assert_eq!(merged.current_started, cycle_eight.current_started);
+            assert_eq!(merged.cycles_completed_at, cycle_eight.cycles_completed_at);
+        }
+    }
+
     #[test]
     fn scanner_metrics_merge_aggregates_partial_cycles_by_source() {
         let collected_at = Utc::now();

crates/obs/src/metrics/stats_collector.rs

@@ -262,11 +262,11 @@ async fn obs_site_replication_stats() -> ReplicationStats {
 }
 
 fn current_scanner_cycle_age_seconds(
-    current_cycle: u64,
+    current_cycle_active: bool,
     current_started: chrono::DateTime<Utc>,
     now: chrono::DateTime<Utc>,
 ) -> u64 {
-    if current_cycle == 0 {
+    if !current_cycle_active {
         0
     } else {
         now.signed_duration_since(current_started).num_seconds().max(0) as u64
@@ -1090,7 +1090,7 @@ pub async fn collect_scanner_metric_stats() -> Option<ScannerStats> {
     let reference_time = metrics.cycles_completed_at.last().copied().unwrap_or(metrics.current_started);
     let last_activity_seconds = now.signed_duration_since(reference_time).num_seconds().max(0) as u64;
     let active_paths = metrics.active_scan_paths as u64;
-    let current_cycle_age_seconds = current_scanner_cycle_age_seconds(metrics.current_cycle, metrics.current_started, now);
+    let current_cycle_age_seconds = current_scanner_cycle_age_seconds(metrics.current_cycle_active, metrics.current_started, now);
     let current_scan_mode = scanner_scan_mode_code(&metrics.current_scan_mode);
     let current_cycle_age = current_cycle_age_seconds as f64;
     let last_cycle_duration = metrics.last_cycle_duration_seconds;
@@ -1464,21 +1464,21 @@ mod tests {
     fn current_scanner_cycle_age_seconds_returns_zero_when_idle() {
         let now = Utc::now();
 
-        assert_eq!(current_scanner_cycle_age_seconds(0, now - chrono::Duration::seconds(30), now), 0);
+        assert_eq!(current_scanner_cycle_age_seconds(false, now - chrono::Duration::seconds(30), now), 0);
     }
 
     #[test]
     fn current_scanner_cycle_age_seconds_clamps_future_start() {
         let now = Utc::now();
 
-        assert_eq!(current_scanner_cycle_age_seconds(4, now + chrono::Duration::seconds(30), now), 0);
+        assert_eq!(current_scanner_cycle_age_seconds(true, now + chrono::Duration::seconds(30), now), 0);
     }
 
     #[test]
-    fn current_scanner_cycle_age_seconds_reports_active_elapsed_time() {
+    fn current_scanner_cycle_age_seconds_reports_active_first_cycle_elapsed_time() {
         let now = Utc::now();
 
-        assert_eq!(current_scanner_cycle_age_seconds(4, now - chrono::Duration::seconds(45), now), 45);
+        assert_eq!(current_scanner_cycle_age_seconds(true, now - chrono::Duration::seconds(45), now), 45);
     }
 
     #[test]

crates/scanner/Cargo.toml

@@ -47,7 +47,7 @@ rmp-serde = { workspace = true }
 hmac = { workspace = true }
 sha2 = { workspace = true }
 rustfs-filemeta = { workspace = true }
-tokio-util = { workspace = true, features = ["io", "compat"] }
+tokio-util = { workspace = true, features = ["io", "compat", "rt"] }
 rustfs-ecstore = { workspace = true }
 rustfs-storage-api = { workspace = true }
 http = { workspace = true }

crates/scanner/src/scanner.rs

@@ -14,6 +14,8 @@
 
 use std::collections::BTreeMap;
 use std::future::Future;
+#[cfg(test)]
+use std::sync::Mutex as StdMutex;
 use std::sync::{Arc, LazyLock, RwLock};
 
 use crate::ScannerObjectIO;
@@ -38,8 +40,8 @@ use bytes::Bytes;
 use chrono::{DateTime, Utc};
 use rustfs_common::heal_channel::HealScanMode;
 use rustfs_common::metrics::{
-    CurrentCycle, Metric, Metrics, ScanCyclePartialReason, ScannerUsageSaveResult, ScannerWorkSource, emit_scan_cycle_complete,
+    CurrentCycle, Metric, Metrics, ScanCyclePartialReason, ScanCycleWorkSnapshot, ScannerUsageSaveResult, ScannerWorkSource,
-    emit_scan_cycle_partial_with_source, emit_scan_cycle_superseded, global_metrics,
+    emit_scan_cycle_complete, emit_scan_cycle_partial_with_source, emit_scan_cycle_superseded, global_metrics,
 };
 use rustfs_config::ScannerSpeed;
 #[cfg(test)]
@@ -50,9 +52,12 @@ use rustfs_config::{
 use rustfs_config::{ENV_SCANNER_CYCLE, ENV_SCANNER_SPEED, ENV_SCANNER_START_DELAY_SECS};
 use serde::{Deserialize, Serialize};
 use sha2::{Digest as _, Sha256};
+#[cfg(test)]
+use tokio::sync::Notify;
 use tokio::sync::mpsc;
 use tokio::time::{Duration, Instant};
 use tokio_util::sync::CancellationToken;
+use tokio_util::task::AbortOnDropHandle;
 use tracing::{debug, error, info, instrument, warn};
 
 use crate::storage_api::scan::{
@@ -93,6 +98,44 @@ const SCANNER_CYCLE_STATE_MAGIC: &[u8; 8] = b"RSCYC001";
 const SCANNER_CYCLE_STATE_HEADER_LEN: usize = 24;
 #[cfg(test)]
 const ENV_SCANNER_START_DELAY_SECS_DEPRECATED: &str = "RUSTFS_DATA_SCANNER_START_DELAY_SECS";
+#[cfg(test)]
+type ScannerCycleStatePersistTestHook = (u64, Arc<Notify>);
+#[cfg(test)]
+static SCANNER_CYCLE_STATE_PERSIST_TEST_HOOK: LazyLock<StdMutex<Option<ScannerCycleStatePersistTestHook>>> =
+    LazyLock::new(|| StdMutex::new(None));
+
+#[cfg(test)]
+struct ScannerCycleStatePersistTestHookGuard;
+
+#[cfg(test)]
+impl Drop for ScannerCycleStatePersistTestHookGuard {
+    fn drop(&mut self) {
+        *SCANNER_CYCLE_STATE_PERSIST_TEST_HOOK
+            .lock()
+            .unwrap_or_else(|poisoned| poisoned.into_inner()) = None;
+    }
+}
+
+#[cfg(test)]
+fn set_scanner_cycle_state_persist_test_hook(leader_epoch: u64, reached: Arc<Notify>) -> ScannerCycleStatePersistTestHookGuard {
+    *SCANNER_CYCLE_STATE_PERSIST_TEST_HOOK
+        .lock()
+        .unwrap_or_else(|poisoned| poisoned.into_inner()) = Some((leader_epoch, reached));
+    ScannerCycleStatePersistTestHookGuard
+}
+
+#[cfg(test)]
+fn notify_scanner_cycle_state_persist_test_hook(leader_epoch: u64) {
+    let reached = SCANNER_CYCLE_STATE_PERSIST_TEST_HOOK
+        .lock()
+        .unwrap_or_else(|poisoned| poisoned.into_inner())
+        .as_ref()
+        .filter(|(expected_epoch, _)| *expected_epoch == leader_epoch)
+        .map(|(_, reached)| reached.clone());
+    if let Some(reached) = reached {
+        reached.notify_one();
+    }
+}
 
 #[derive(Debug, thiserror::Error)]
 enum ScannerCycleStateError {
@@ -1691,10 +1734,10 @@ fn data_usage_persist_timeout() -> Duration {
     DataUsageCache::persistence_timeout()
 }
 
-async fn mark_scan_cycle_idle(cycle_info: &mut CurrentCycle) {
+async fn mark_scan_cycle_idle(cycle_info: &mut CurrentCycle, cycle_metrics_guard: &mut ScannerCycleMetricsGuard) {
     cycle_info.current = 0;
     global_metrics().clear_current_scan_mode();
-    global_metrics().set_cycle(Some(cycle_info.clone())).await;
+    cycle_metrics_guard.finish(cycle_info.clone()).await;
 }
 
 fn encode_scanner_cycle_state(cycle_info: &CurrentCycle, leader_epoch: u64) -> Result<Vec<u8>, ScannerCycleStateError> {
@@ -2218,6 +2261,8 @@ async fn persist_scanner_cycle_state(
             return false;
         }
 
+        #[cfg(test)]
+        notify_scanner_cycle_state_persist_test_hook(leader_epoch);
         match save_config_with_preconditions(storeapi.clone(), &DATA_USAGE_BLOOM_NAME_PATH, buf.clone(), revision.preconditions())
             .await
         {
@@ -2340,7 +2385,6 @@ async fn persist_scanner_cycle_state(
 
                     if persisted_cycle.next >= cycle_info.next {
                         *cycle_info = persisted_cycle;
-                        global_metrics().set_cycle(Some(cycle_info.clone())).await;
                         debug!(
                             target: "rustfs::scanner",
                             event = EVENT_SCANNER_PERSIST_STATE,
@@ -2406,6 +2450,7 @@ async fn finalize_partial_scan_cycle(
     cycle_info: &mut CurrentCycle,
     revision: &mut DataUsageCacheRevision,
     leader_epoch: u64,
+    cycle_metrics_guard: &mut ScannerCycleMetricsGuard,
 ) -> bool {
     // A budget-limited cycle is deliberate pacing, not a failure. The cycle counter
     // must still advance (and persist) because per-bucket next_cycle is stamped from
@@ -2422,11 +2467,14 @@ async fn finalize_partial_scan_cycle(
             error = %err,
             "Scanner partial cycle could not advance"
         );
-        mark_scan_cycle_idle(cycle_info).await;
+        mark_scan_cycle_idle(cycle_info, cycle_metrics_guard).await;
         return false;
     }
-    mark_scan_cycle_idle(cycle_info).await;
+    cycle_info.current = 0;
-    persist_scanner_cycle_state(ctx, storeapi, cycle_info, revision, leader_epoch).await
+    global_metrics().clear_current_scan_mode();
+    let persisted = persist_scanner_cycle_state(ctx, storeapi, cycle_info, revision, leader_epoch).await;
+    cycle_metrics_guard.finish(cycle_info.clone()).await;
+    persisted
 }
 
 async fn persist_required_scanner_cycle_floor(
@@ -2436,6 +2484,7 @@ async fn persist_required_scanner_cycle_floor(
     revision: &mut DataUsageCacheRevision,
     leader_epoch: u64,
     required_cycle: u64,
+    cycle_metrics_guard: &mut ScannerCycleMetricsGuard,
 ) -> bool {
     if required_cycle <= cycle_info.current || required_cycle == u64::MAX {
         error!(
@@ -2448,13 +2497,16 @@ async fn persist_required_scanner_cycle_floor(
             state = "invalid_cache_cycle_floor",
             "Scanner cache cycle floor is invalid"
         );
-        mark_scan_cycle_idle(cycle_info).await;
+        mark_scan_cycle_idle(cycle_info, cycle_metrics_guard).await;
         return false;
     }
 
     cycle_info.next = cycle_info.next.max(required_cycle);
-    mark_scan_cycle_idle(cycle_info).await;
+    cycle_info.current = 0;
-    persist_scanner_cycle_state(ctx, storeapi, cycle_info, revision, leader_epoch).await
+    global_metrics().clear_current_scan_mode();
+    let persisted = persist_scanner_cycle_state(ctx, storeapi, cycle_info, revision, leader_epoch).await;
+    cycle_metrics_guard.finish(cycle_info.clone()).await;
+    persisted
 }
 
 async fn await_scanner_cycle_with_lock_fence<Cycle, LockLost>(
@@ -2513,7 +2565,7 @@ async fn run_data_scanner_cycle(
     let now = Instant::now();
     cycle_info.started = Utc::now();
 
-    global_metrics().set_cycle(Some(cycle_info.clone())).await;
+    let mut cycle_metrics_guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
 
     let mut background_heal_info = read_background_heal_info(storeapi.clone()).await;
 
@@ -2564,14 +2616,14 @@ async fn run_data_scanner_cycle(
                 "Scanner cycle could not capture the data usage persistence baseline"
             );
             emit_scan_cycle_complete(false, cycle_start.elapsed());
-            mark_scan_cycle_idle(cycle_info).await;
+            mark_scan_cycle_idle(cycle_info, &mut cycle_metrics_guard).await;
             return ScannerCycleOutcome::Failed;
         }
     };
     let (sender, receiver) = mpsc::channel::<DataUsageInfo>(1);
     let storeapi_clone = storeapi.clone();
     let ctx_clone = ctx.clone();
-    let mut usage_persist_task = tokio::spawn(async move {
+    let mut usage_persist_task = AbortOnDropHandle::new(tokio::spawn(async move {
         store_data_usage_in_backend_with_outcome_for_epoch_and_baseline(
             ctx_clone,
             storeapi_clone,
@@ -2580,10 +2632,9 @@ async fn run_data_scanner_cycle(
             Some(usage_persist_baseline),
         )
         .await
-    });
+    }));
 
     let done_cycle = Metrics::time(Metric::ScanCycle);
-    let cycle_work_start = global_metrics().start_scan_cycle_work();
     let cycle_budget = ScannerCycleBudget::new(ctx, cycle_budget_config);
     let scan_result = storeapi
         .clone()
@@ -2640,7 +2691,6 @@ async fn run_data_scanner_cycle(
         }
     };
     let unresolved_heal_work = global_metrics().current_scan_cycle_has_unresolved_heal_work();
-    global_metrics().finish_scan_cycle_work(cycle_work_start);
 
     let scan_cycle_result = match scan_result {
         Ok(result) => result,
@@ -2663,7 +2713,7 @@ async fn run_data_scanner_cycle(
             {
                 save_background_heal_info(storeapi.clone(), new_heal_info).await;
             }
-            mark_scan_cycle_idle(cycle_info).await;
+            mark_scan_cycle_idle(cycle_info, &mut cycle_metrics_guard).await;
             return ScannerCycleOutcome::Failed;
         }
     };
@@ -2678,7 +2728,7 @@ async fn run_data_scanner_cycle(
             "Scanner cycle stopped before committing cycle state"
         );
         emit_scan_cycle_complete(false, cycle_start.elapsed());
-        mark_scan_cycle_idle(cycle_info).await;
+        mark_scan_cycle_idle(cycle_info, &mut cycle_metrics_guard).await;
         return ScannerCycleOutcome::Failed;
     }
     if let Some(required_cycle) = scan_cycle_result.required_cycle_floor() {
@@ -2700,6 +2750,7 @@ async fn run_data_scanner_cycle(
             cycle_revision,
             leader_epoch,
             required_cycle,
+            &mut cycle_metrics_guard,
         )
         .await
         {
@@ -2719,7 +2770,7 @@ async fn run_data_scanner_cycle(
             "Scanner cycle completed without a durable data usage snapshot"
         );
         emit_scan_cycle_complete(false, cycle_start.elapsed());
-        mark_scan_cycle_idle(cycle_info).await;
+        mark_scan_cycle_idle(cycle_info, &mut cycle_metrics_guard).await;
         return ScannerCycleOutcome::Failed;
     }
     if budget_elapsed {
@@ -2743,7 +2794,16 @@ async fn run_data_scanner_cycle(
             scan_cycle_partial_reason(budget_reason),
             scan_cycle_partial_source(budget_reason),
         );
-        return if finalize_partial_scan_cycle(ctx, storeapi.clone(), cycle_info, cycle_revision, leader_epoch).await {
+        return if finalize_partial_scan_cycle(
+            ctx,
+            storeapi.clone(),
+            cycle_info,
+            cycle_revision,
+            leader_epoch,
+            &mut cycle_metrics_guard,
+        )
+        .await
+        {
             ScannerCycleOutcome::Partial
         } else {
             ScannerCycleOutcome::Failed
@@ -2792,7 +2852,7 @@ async fn run_data_scanner_cycle(
                 "Scanner cycle completed without a durable data usage snapshot"
             );
             emit_scan_cycle_complete(false, cycle_start.elapsed());
-            mark_scan_cycle_idle(cycle_info).await;
+            mark_scan_cycle_idle(cycle_info, &mut cycle_metrics_guard).await;
             return ScannerCycleOutcome::Failed;
         }
         ScannerCycleOutcome::Partial => {
@@ -2818,7 +2878,16 @@ async fn run_data_scanner_cycle(
                 );
             }
             emit_scan_cycle_partial_with_source(cycle_start.elapsed(), ScanCyclePartialReason::Unknown, None);
-            return if finalize_partial_scan_cycle(ctx, storeapi.clone(), cycle_info, cycle_revision, leader_epoch).await {
+            return if finalize_partial_scan_cycle(
+                ctx,
+                storeapi.clone(),
+                cycle_info,
+                cycle_revision,
+                leader_epoch,
+                &mut cycle_metrics_guard,
+            )
+            .await
+            {
                 ScannerCycleOutcome::Partial
             } else {
                 ScannerCycleOutcome::Failed
@@ -2834,7 +2903,16 @@ async fn run_data_scanner_cycle(
                 state = "superseded",
                 "Scanner cycle usage snapshot was superseded by concurrent namespace activity"
             );
-            if finalize_partial_scan_cycle(ctx, storeapi.clone(), cycle_info, cycle_revision, leader_epoch).await {
+            if finalize_partial_scan_cycle(
+                ctx,
+                storeapi.clone(),
+                cycle_info,
+                cycle_revision,
+                leader_epoch,
+                &mut cycle_metrics_guard,
+            )
+            .await
+            {
                 emit_scan_cycle_superseded(cycle_start.elapsed());
                 return ScannerCycleOutcome::Superseded;
             }
@@ -2853,7 +2931,7 @@ async fn run_data_scanner_cycle(
             error = %err,
             "Scanner completed cycle could not advance"
         );
-        mark_scan_cycle_idle(cycle_info).await;
+        mark_scan_cycle_idle(cycle_info, &mut cycle_metrics_guard).await;
         emit_scan_cycle_complete(false, cycle_start.elapsed());
         return ScannerCycleOutcome::Failed;
     }
@@ -2862,9 +2940,8 @@ async fn run_data_scanner_cycle(
     global_metrics().clear_current_scan_mode();
 
     retain_recent_cycle_completions(&mut cycle_info.cycle_completed);
-    global_metrics().set_cycle(Some(cycle_info.clone())).await;
     if !persist_scanner_cycle_state(ctx, storeapi.clone(), cycle_info, cycle_revision, leader_epoch).await {
-        mark_scan_cycle_idle(cycle_info).await;
+        cycle_metrics_guard.finish(cycle_info.clone()).await;
         emit_scan_cycle_complete(false, cycle_start.elapsed());
         return ScannerCycleOutcome::Failed;
     }
@@ -2888,9 +2965,37 @@ async fn run_data_scanner_cycle(
         "Scanner cycle completed"
     );
 
+    cycle_metrics_guard.finish(cycle_info.clone()).await;
     scanner_cycle_outcome_with_pending_maintenance(ScannerCycleOutcome::Completed, pending_maintenance_work)
 }
 
+struct ScannerCycleMetricsGuard {
+    start: Option<ScanCycleWorkSnapshot>,
+}
+
+impl ScannerCycleMetricsGuard {
+    async fn new(cycle: CurrentCycle) -> Self {
+        Self {
+            start: Some(global_metrics().start_scan_cycle_work_with_cycle(cycle).await),
+        }
+    }
+
+    async fn finish(&mut self, cycle: CurrentCycle) {
+        if let Some(start) = self.start {
+            global_metrics().finish_scan_cycle_work_with_cycle(start, cycle).await;
+            self.start = None;
+        }
+    }
+}
+
+impl Drop for ScannerCycleMetricsGuard {
+    fn drop(&mut self) {
+        if let Some(start) = self.start.take() {
+            global_metrics().finish_scan_cycle_work(start);
+        }
+    }
+}
+
 async fn record_scanner_leader_lock_lost(message: &'static str) {
     reset_scanner_cycle_schedule();
     record_scanner_leader_lock_state("lost");
@@ -3443,7 +3548,7 @@ enum DataUsagePersistTaskResult {
 
 async fn wait_for_data_usage_persist_task(
     ctx: &CancellationToken,
-    task: &mut tokio::task::JoinHandle<DataUsagePersistOutcome>,
+    task: &mut AbortOnDropHandle<DataUsagePersistOutcome>,
     timeout: Duration,
 ) -> DataUsagePersistTaskResult {
     tokio::select! {
@@ -3840,8 +3945,9 @@ mod tests {
     use super::*;
     use crate::EcstoreResult;
     use crate::{
-        ScannerGetObjectReader as GetObjectReader, ScannerObjectInfo as ObjectInfo, ScannerObjectOptions as ObjectOptions,
+        Endpoint, EndpointServerPools, Endpoints, InstanceContext, PoolEndpoints, ScannerGetObjectReader as GetObjectReader,
-        ScannerPutObjReader as PutObjReader,
+        ScannerObjectInfo as ObjectInfo, ScannerObjectOptions as ObjectOptions, ScannerPutObjReader as PutObjReader,
+        init_bucket_metadata_sys_for_scanner_tests, init_ecstore_config_for_scanner_tests, init_local_disks_with_instance_ctx,
     };
     use serial_test::serial;
     use std::collections::HashMap;
@@ -3853,6 +3959,47 @@ mod tests {
 
     const TEST_DEFAULT_SCANNER_CYCLE_SECS: u64 = 24 * 60 * 60;
 
+    async fn setup_scanner_cycle_store() -> (tempfile::TempDir, Arc<ECStore>) {
+        init_ecstore_config_for_scanner_tests();
+        let temp_dir = tempfile::tempdir().expect("scanner cycle test directory should be created");
+        let mut endpoints = Vec::new();
+        for disk_index in 0..4 {
+            let disk_path = temp_dir.path().join(format!("disk{disk_index}"));
+            tokio::fs::create_dir_all(&disk_path)
+                .await
+                .expect("scanner cycle test disk should be created");
+            let mut endpoint =
+                Endpoint::try_from(disk_path.to_str().expect("disk path should be utf8")).expect("endpoint should parse");
+            endpoint.set_pool_index(0);
+            endpoint.set_set_index(0);
+            endpoint.set_disk_index(disk_index);
+            endpoints.push(endpoint);
+        }
+        let endpoint_pools = EndpointServerPools::from(vec![PoolEndpoints {
+            legacy: false,
+            set_count: 1,
+            drives_per_set: 4,
+            endpoints: Endpoints::from(endpoints),
+            cmd_line: "scanner-cycle-metrics".to_string(),
+            platform: format!("OS: {} | Arch: {}", std::env::consts::OS, std::env::consts::ARCH),
+        }]);
+        let instance_ctx = Arc::new(InstanceContext::new());
+        init_local_disks_with_instance_ctx(&instance_ctx, endpoint_pools.clone())
+            .await
+            .expect("scanner cycle test disks should initialize");
+        let store = ECStore::new_with_instance_ctx(
+            "127.0.0.1:0".parse().expect("test address should parse"),
+            endpoint_pools,
+            CancellationToken::new(),
+            instance_ctx,
+        )
+        .await
+        .expect("scanner cycle test ECStore should initialize");
+        init_bucket_metadata_sys_for_scanner_tests(store.clone()).await;
+
+        (temp_dir, store)
+    }
+
     fn assert_run_data_scanner_signature<F, Fut>(_run: F)
     where
         F: Fn(CancellationToken, Arc<ECStore>) -> Fut,
@@ -4312,9 +4459,9 @@ mod tests {
         };
 
         global_metrics().set_current_scan_mode(HealScanMode::Deep);
-        global_metrics().set_cycle(Some(cycle_info.clone())).await;
+        let mut cycle_metrics_guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
 
-        mark_scan_cycle_idle(&mut cycle_info).await;
+        mark_scan_cycle_idle(&mut cycle_info, &mut cycle_metrics_guard).await;
 
         let published = global_metrics()
             .get_cycle()
@@ -4330,6 +4477,123 @@ mod tests {
         global_metrics().set_cycle(None).await;
     }
 
+    #[tokio::test]
+    #[serial]
+    async fn scanner_cycle_metrics_guard_covers_published_first_cycle_lifetime() {
+        let cycle_started = Utc::now() - chrono::Duration::seconds(5);
+        let mut cycle_info = CurrentCycle {
+            current: 0,
+            next: 1,
+            started: cycle_started,
+            ..Default::default()
+        };
+        let mut guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
+        let setup_report = global_metrics().report().await;
+        assert!(setup_report.current_cycle_active);
+        assert_eq!(setup_report.current_cycle, 0);
+        assert_eq!(setup_report.current_started, cycle_started);
+
+        mark_scan_cycle_idle(&mut cycle_info, &mut guard).await;
+        let idle_report = global_metrics().report().await;
+        assert!(!idle_report.current_cycle_active);
+
+        global_metrics().set_cycle(None).await;
+    }
+
+    #[tokio::test]
+    #[serial]
+    async fn scanner_cycle_metrics_guard_keeps_active_cycle_published_during_finalization() {
+        let mut cycle_info = CurrentCycle {
+            current: 12,
+            next: 13,
+            started: Utc::now(),
+            ..Default::default()
+        };
+        let mut guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
+
+        cycle_info.current = 0;
+        tokio::task::yield_now().await;
+        let finalizing_report = global_metrics().report().await;
+        assert!(finalizing_report.current_cycle_active);
+        assert_eq!(finalizing_report.current_cycle, 12);
+
+        guard.finish(cycle_info).await;
+        let idle_report = global_metrics().report().await;
+        assert!(!idle_report.current_cycle_active);
+        assert_eq!(idle_report.current_cycle, 0);
+
+        global_metrics().set_cycle(None).await;
+    }
+
+    #[tokio::test]
+    #[serial]
+    async fn scanner_cycle_metrics_guard_drop_clears_activity() {
+        let guard = ScannerCycleMetricsGuard::new(CurrentCycle {
+            current: 12,
+            next: 13,
+            started: Utc::now(),
+            ..Default::default()
+        })
+        .await;
+        assert!(global_metrics().report().await.current_cycle_active);
+
+        drop(guard);
+
+        assert!(!global_metrics().report().await.current_cycle_active);
+        global_metrics().set_cycle(None).await;
+    }
+
+    #[tokio::test]
+    #[serial]
+    async fn run_data_scanner_cycle_publishes_activity_for_owner_lifetime() {
+        let (_temp_dir, store) = setup_scanner_cycle_store().await;
+        let ctx = CancellationToken::new();
+        let mut cycle_info = CurrentCycle::default();
+        let mut revision = DataUsageCacheRevision::Missing;
+        let leader_epoch = u64::MAX - 1;
+        let state_persist_reached = Arc::new(Notify::new());
+        let _state_persist_hook = set_scanner_cycle_state_persist_test_hook(leader_epoch, state_persist_reached.clone());
+        let state_lock = store
+            .new_ns_lock(RUSTFS_META_BUCKET, DATA_USAGE_BLOOM_NAME_PATH.as_str())
+            .await
+            .expect("scanner cycle state lock should be created");
+        let state_guard = state_lock
+            .get_write_lock(Duration::from_secs(1))
+            .await
+            .expect("scanner cycle state lock should be acquired");
+        let mut cycle = Box::pin(run_data_scanner_cycle(&ctx, &store, &mut cycle_info, &mut revision, leader_epoch));
+        let waker = std::task::Waker::noop();
+        let mut context = std::task::Context::from_waker(waker);
+
+        assert!(cycle.as_mut().poll(&mut context).is_pending());
+        let active = global_metrics().report().await;
+        assert!(active.current_cycle_active);
+        assert_eq!(active.current_cycle, 0);
+
+        tokio::time::timeout(Duration::from_secs(30), async {
+            tokio::select! {
+                outcome = &mut cycle => panic!("scanner cycle finished before state persistence was released: {outcome:?}"),
+                _ = state_persist_reached.notified() => {}
+            }
+        })
+        .await
+        .expect("scanner cycle should reach state persistence");
+        let finalizing = global_metrics().report().await;
+        assert!(finalizing.current_cycle_active);
+
+        drop(state_guard);
+        let outcome = tokio::time::timeout(Duration::from_secs(30), cycle)
+            .await
+            .expect("scanner cycle should finish");
+        assert!(matches!(
+            outcome,
+            ScannerCycleOutcome::Completed | ScannerCycleOutcome::CompletedWithPendingMaintenance
+        ));
+        assert!(!global_metrics().report().await.current_cycle_active);
+
+        global_metrics().set_cycle(None).await;
+    }
+
     #[tokio::test]
     #[serial]
     async fn test_finalize_partial_scan_cycle_advances_and_persists_counter() {
@@ -4342,8 +4606,11 @@ mod tests {
             cycle_completed: vec![],
             started: Utc::now(),
         };
+        let mut cycle_metrics_guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
 
-        assert!(finalize_partial_scan_cycle(&ctx, store.clone(), &mut cycle_info, &mut revision, 1).await);
+        assert!(
+            finalize_partial_scan_cycle(&ctx, store.clone(), &mut cycle_info, &mut revision, 1, &mut cycle_metrics_guard,).await
+        );
 
         assert_eq!(cycle_info.next, 13);
         assert_eq!(cycle_info.current, 0);
@@ -4377,8 +4644,20 @@ mod tests {
             cycle_completed: vec![],
             started: Utc::now(),
         };
+        let mut cycle_metrics_guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
 
-        assert!(persist_required_scanner_cycle_floor(&ctx, store.clone(), &mut cycle_info, &mut revision, 7, 19).await);
+        assert!(
+            persist_required_scanner_cycle_floor(
+                &ctx,
+                store.clone(),
+                &mut cycle_info,
+                &mut revision,
+                7,
+                19,
+                &mut cycle_metrics_guard,
+            )
+            .await
+        );
         assert_eq!(cycle_info.current, 0);
         assert_eq!(cycle_info.next, 19);
 
@@ -4405,22 +4684,37 @@ mod tests {
             cycle_completed: vec![],
             started: Utc::now(),
         };
+        let mut cycle_metrics_guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
 
-        assert!(!persist_required_scanner_cycle_floor(&ctx, store.clone(), &mut cycle_info, &mut revision, 7, 12).await);
-        assert_eq!(cycle_info.next, 12);
-        assert_eq!(revision, DataUsageCacheRevision::Missing);
         assert!(
             !persist_required_scanner_cycle_floor(
                 &ctx,
                 store.clone(),
-                &mut CurrentCycle {
+                &mut cycle_info,
-                    current: 12,
+                &mut revision,
-                    next: 12,
+                7,
-                    ..Default::default()
+                12,
-                },
+                &mut cycle_metrics_guard,
+            )
+            .await
+        );
+        assert_eq!(cycle_info.next, 12);
+        assert_eq!(revision, DataUsageCacheRevision::Missing);
+        let mut max_cycle_info = CurrentCycle {
+            current: 12,
+            next: 12,
+            ..Default::default()
+        };
+        let mut max_cycle_metrics_guard = ScannerCycleMetricsGuard::new(max_cycle_info.clone()).await;
+        assert!(
+            !persist_required_scanner_cycle_floor(
+                &ctx,
+                store.clone(),
+                &mut max_cycle_info,
                 &mut revision,
                 7,
                 u64::MAX,
+                &mut max_cycle_metrics_guard,
             )
             .await
         );
@@ -4685,8 +4979,9 @@ mod tests {
             cycle_completed: vec![],
             started: Utc::now(),
         };
+        let mut cycle_metrics_guard = ScannerCycleMetricsGuard::new(cycle_info.clone()).await;
 
-        assert!(!finalize_partial_scan_cycle(&ctx, store, &mut cycle_info, &mut revision, 1).await);
+        assert!(!finalize_partial_scan_cycle(&ctx, store, &mut cycle_info, &mut revision, 1, &mut cycle_metrics_guard,).await);
         assert_eq!(cycle_info.next, 13);
         assert_eq!(cycle_info.current, 0);
         assert_eq!(revision, DataUsageCacheRevision::Missing);
@@ -5943,10 +6238,10 @@ mod tests {
     #[tokio::test]
     async fn data_usage_persist_wait_aborts_when_scanner_is_cancelled() {
         let ctx = CancellationToken::new();
-        let mut task = tokio::spawn(async {
+        let mut task = AbortOnDropHandle::new(tokio::spawn(async {
             std::future::pending::<()>().await;
             DataUsagePersistOutcome::Saved
-        });
+        }));
         ctx.cancel();
 
         let result = wait_for_data_usage_persist_task(&ctx, &mut task, Duration::from_secs(60)).await;
@@ -5958,10 +6253,10 @@ mod tests {
     #[tokio::test(start_paused = true)]
     async fn data_usage_persist_wait_aborts_after_timeout() {
         let ctx = CancellationToken::new();
-        let mut task = tokio::spawn(async {
+        let mut task = AbortOnDropHandle::new(tokio::spawn(async {
             std::future::pending::<()>().await;
             DataUsagePersistOutcome::Saved
-        });
+        }));
 
         let result = wait_for_data_usage_persist_task(&ctx, &mut task, Duration::from_secs(30)).await;