fix(heal): coalesce duplicate MRF intents

crates/scanner/src/scanner_folder.rs

@@ -1375,13 +1375,14 @@ impl FolderScanner {
                             // Single-flight (backlog#1894 axis A) — the
                             // recording mode and its guarantees are pinned by
                             // corrupt_metadata_recording below.
-                            let mrf_accepted = rustfs_common::mrf_channel::try_send_mrf_intent(
+                            let mrf_result = rustfs_common::mrf_channel::try_send_mrf_intent_typed(
                                 rustfs_common::mrf_channel::MrfKind::MetadataCorruption,
                                 &item.bucket,
                                 &object,
                                 None,
+                                None,
                             );
-                            match corrupt_metadata_recording(mrf_accepted) {
+                            match corrupt_metadata_recording(mrf_result) {
                                 CorruptMetadataRecording::LedgerOnly => {
                                     // Recorded as Full (retry-later): admission
                                     // for this target happens in the MRF

crates/scanner/src/scanner_folder/item_actions.rs

@@ -50,11 +50,12 @@ pub(super) enum CorruptMetadataRecording {
     ImmediateAndLedger,
 }
 
-pub(super) fn corrupt_metadata_recording(mrf_accepted: bool) -> CorruptMetadataRecording {
-    if mrf_accepted {
-        CorruptMetadataRecording::LedgerOnly
-    } else {
-        CorruptMetadataRecording::ImmediateAndLedger
+pub(super) fn corrupt_metadata_recording(result: rustfs_common::mrf_channel::MrfIngressResult) -> CorruptMetadataRecording {
+    match result {
+        rustfs_common::mrf_channel::MrfIngressResult::Enqueued | rustfs_common::mrf_channel::MrfIngressResult::Coalesced => {
+            CorruptMetadataRecording::LedgerOnly
+        }
+        rustfs_common::mrf_channel::MrfIngressResult::Dropped(_) => CorruptMetadataRecording::ImmediateAndLedger,
     }
 }
 

crates/scanner/src/scanner_folder/tests.rs

@@ -48,8 +48,20 @@ fn scanner_alert_wire_names_match_canonical_event_names() {
 /// the backstop survives regardless of delivery.
 #[test]
 fn corrupt_metadata_recording_maps_delivery_to_backstop() {
-    assert_eq!(corrupt_metadata_recording(true), CorruptMetadataRecording::LedgerOnly);
-    assert_eq!(corrupt_metadata_recording(false), CorruptMetadataRecording::ImmediateAndLedger);
+    assert_eq!(
+        corrupt_metadata_recording(rustfs_common::mrf_channel::MrfIngressResult::Enqueued),
+        CorruptMetadataRecording::LedgerOnly
+    );
+    assert_eq!(
+        corrupt_metadata_recording(rustfs_common::mrf_channel::MrfIngressResult::Coalesced),
+        CorruptMetadataRecording::LedgerOnly
+    );
+    assert_eq!(
+        corrupt_metadata_recording(rustfs_common::mrf_channel::MrfIngressResult::Dropped(
+            rustfs_common::mrf_channel::MrfDropReason::Full
+        )),
+        CorruptMetadataRecording::ImmediateAndLedger
+    );
 }
 
 fn cooldown_map_len() -> usize {