add metrics

crates/obs/src/metrics/logger_webhook.rs

@@ -0,0 +1,35 @@
+use crate::metrics::{new_counter_md, new_gauge_md, subsystems, MetricDescriptor, MetricName};
+
+/// 定义标签常量
+pub const NAME_LABEL: &str = "name";
+pub const ENDPOINT_LABEL: &str = "endpoint";
+
+/// Webhook 日志相关指标描述符
+lazy_static::lazy_static! {
+    // 所有 Webhook 指标使用的标签
+    static ref ALL_WEBHOOK_LABELS: [&'static str; 2] = [NAME_LABEL, ENDPOINT_LABEL];
+
+    pub static ref WEBHOOK_FAILED_MESSAGES_MD: MetricDescriptor =
+        new_counter_md(
+            MetricName::WebhookFailedMessages,
+            "Number of messages that failed to send",
+            &ALL_WEBHOOK_LABELS[..],
+            subsystems::LOGGER_WEBHOOK
+        );
+
+    pub static ref WEBHOOK_QUEUE_LENGTH_MD: MetricDescriptor =
+        new_gauge_md(
+            MetricName::WebhookQueueLength,
+            "Webhook queue length",
+            &ALL_WEBHOOK_LABELS[..],
+            subsystems::LOGGER_WEBHOOK
+        );
+
+    pub static ref WEBHOOK_TOTAL_MESSAGES_MD: MetricDescriptor =
+        new_counter_md(
+            MetricName::WebhookTotalMessages,
+            "Total number of messages sent to this target",
+            &ALL_WEBHOOK_LABELS[..],
+            subsystems::LOGGER_WEBHOOK
+        );
+}