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Add Prometheus metrics for connections, firewall, L7, and bytes transferred

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Instrument mc-proxy with prometheus/client_golang. New internal/metrics/
package defines counters, gauges, and histograms for connection totals,
active connections, firewall blocks by reason, backend dial latency,
bytes transferred, L7 HTTP status codes, and L7 policy blocks. Optional
[metrics] config section starts a scrape endpoint. Firewall gains
BlockedWithReason() to report block cause. L7 handler wraps
ResponseWriter to record status codes per hostname.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Kyle Isom
2026-03-25 18:05:25 -07:00
parent 42c7fffc3e
commit ffc31f7d55
16 changed files with 439 additions and 32 deletions
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23
PROGRESS.md
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@@ -71,20 +71,21 @@ proceeds. Each item is marked:
## Phase 8: Prometheus Metrics
- [ ] 8.1 Dependency: add `prometheus/client_golang`
- [ ] 8.2 Config: `Metrics` section (`addr`, `path`)
- [ ] 8.3 Package: `internal/metrics/` definitions and HTTP server
- [ ] 8.4 Instrumentation: connections, firewall, dial latency, bytes, HTTP status, policy blocks
- [ ] 8.5 Firewall: `BlockedWithReason()` method
- [ ] 8.6 L7: status recording on ResponseWriter
- [ ] 8.7 Startup: conditionally start metrics server
- [ ] 8.8 Tests: metric sanity, server endpoint, `BlockedWithReason`
- [x] 8.1 Dependency: add `prometheus/client_golang`
- [x] 8.2 Config: `Metrics` section (`addr`, `path`)
- [x] 8.3 Package: `internal/metrics/` definitions and HTTP server
- [x] 8.4 Instrumentation: connections, firewall, dial latency, bytes, HTTP status, policy blocks
- [x] 8.5 Firewall: `BlockedWithReason()` method
- [x] 8.6 L7: status recording on ResponseWriter
- [x] 8.7 Startup: conditionally start metrics server
- [x] 8.8 Tests: metric sanity, server endpoint, `BlockedWithReason`
---
## Current State
Phases 1-6 complete. Per-listener connection limits are implemented and
tested. L7 policies and Prometheus metrics are next.
Phases 1-8 complete. Prometheus metrics are instrumented across
connections, firewall, dial latency, bytes transferred, L7 HTTP status
codes, and L7 policy blocks.
`go vet` and `go test` pass across all 13 packages.
`go vet` and `go test` pass across all 14 packages.