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feat: add Prometheus metrics for chatd subsystem (#24371)

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Adds 7 Prometheus metrics to the chatd subsystem and introduces typed
`ActivityBumpReason` for deadline bump attribution.

| Metric | Type | Labels |
|--------|------|--------|
| `coderd_chatd_chats` | Gauge | `state` (streaming, waiting) |
| `coderd_chatd_message_count` | Histogram | `provider` |
| `coderd_chatd_prompt_size_bytes` | Histogram | `provider` |
| `coderd_chatd_tool_result_size_bytes` | Histogram | `provider`,
`tool_name` |
| `coderd_chatd_ttft_seconds` | Histogram | `provider` |
| `coderd_chatd_compaction_total` | Counter | `provider`, `result` |
| `coderd_chatd_steps_total` | Counter | `provider` |

> 🤖
This commit is contained in:
Cian Johnston
2026-04-15 19:53:10 +01:00
committed by GitHub
parent 2b68a1f4bd
commit d7439a9de0
13 changed files with 644 additions and 13 deletions
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enterprise/coderd/workspaces_test.go
+2 -2
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@@ -2908,7 +2908,7 @@ func TestPrebuildActivityBump(t *testing.T) {
require.Zero(t, prebuild.LatestBuild.MaxDeadline)
// When: activity bump is applied to an unclaimed prebuild
workspacestats.ActivityBumpWorkspace(ctx, log, db, prebuild.ID, clock.Now().Add(10*time.Hour))
workspacestats.ActivityBumpWorkspace(ctx, log, db, prebuild.ID, clock.Now().Add(10*time.Hour), workspacestats.ActivityBumpReasonWorkspaceStats)
// Then: prebuild Deadline/MaxDeadline remain unchanged
prebuild = coderdtest.MustWorkspace(t, client, wb.Workspace.ID)
@@ -2941,7 +2941,7 @@ func TestPrebuildActivityBump(t *testing.T) {
workspace = coderdtest.MustWorkspace(t, client, claimedWorkspace.ID)
// When: activity bump is applied to a claimed prebuild
workspacestats.ActivityBumpWorkspace(ctx, log, db, workspace.ID, clock.Now().Add(10*time.Hour))
workspacestats.ActivityBumpWorkspace(ctx, log, db, workspace.ID, clock.Now().Add(10*time.Hour), workspacestats.ActivityBumpReasonWorkspaceStats)
// Then: Deadline is extended by the activity bump, MaxDeadline remains unset
workspace = coderdtest.MustWorkspace(t, client, claimedWorkspace.ID)