feat: freeze typed metrics registry and bounded exemplars

2026-08-14 11:52:00 +03:00
parent 17c8e3a8f0
commit 8e709acea9
29 changed files with 1690 additions and 103 deletions
@@ -0,0 +1,39 @@
+use std::{collections::BTreeSet, time::Duration};
+
+use crank_metrics::{
+    HttpMethod, HttpRoute, HttpStatusClass, McpMethod, McpOutcome, McpResponseMode,
+    record_http_request, record_mcp_request,
+};
+use metrics_util::debugging::DebuggingRecorder;
+
+#[test]
+fn one_million_hostile_values_collapse_to_the_same_closed_series() {
+    let recorder = DebuggingRecorder::new();
+    let snapshotter = recorder.snapshotter();
+    metrics::with_local_recorder(&recorder, || {
+        for index in 0..1_000_000_u32 {
+            let canary = format!("workspace-{index}-request-trace-url-secret");
+            record_http_request(
+                HttpRoute::from_matched_path(&canary),
+                HttpMethod::classify(&canary),
+                HttpStatusClass::from_status(999),
+                Duration::ZERO,
+            );
+            record_mcp_request(
+                McpMethod::Invalid,
+                McpResponseMode::Unknown,
+                McpOutcome::Other,
+                Duration::ZERO,
+            );
+        }
+    });
+
+    let series = snapshotter
+        .snapshot()
+        .into_vec()
+        .into_iter()
+        .map(|(key, _, _, _)| format!("{:?}", key.key()))
+        .collect::<BTreeSet<_>>();
+    assert_eq!(series.len(), 4);
+    assert!(series.iter().all(|value| !value.contains("workspace-")));
+}