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feat(metrics): Prometheus collectors + typed API + HTTP middleware (ADR-030, #15)

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New internal/metrics package: AI metrics (summarize/caption/chat latency, LLM
tokens), session metrics (requests+latency by bounded route pattern, logins), and
a /metrics Handler. Adapters call a typed API; never touch prometheus types.
Dep: github.com/prometheus/client_golang (standard Go client; cluster runs
prometheus-operator). TDD: collectors + middleware route-pattern cardinality
covered.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
mathias
2026-06-12 08:32:41 +02:00
co-authored by Claude Opus 4.8
parent 64d11af9ef
commit a5a8cf6f6d
4 changed files with 268 additions and 7 deletions
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go.mod
+11 -1
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@@ -9,23 +9,33 @@ require (
github.com/go-jose/go-jose/v4 v4.1.4
github.com/golang-migrate/migrate/v4 v4.19.1
github.com/jackc/pgx/v5 v5.9.2
github.com/prometheus/client_golang v1.23.2
github.com/prometheus/client_model v0.6.2
github.com/stretchr/testify v1.11.1
golang.org/x/crypto v0.45.0
golang.org/x/oauth2 v0.36.0
golang.org/x/time v0.15.0
)
require (
github.com/beorn7/perks v1.0.1 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
github.com/jackc/pgerrcode v0.0.0-20220416144525-469b46aa5efa // indirect
github.com/jackc/pgpassfile v1.0.0 // indirect
github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
github.com/jackc/puddle/v2 v2.2.2 // indirect
github.com/kylelemons/godebug v1.1.0 // indirect
github.com/lib/pq v1.10.9 // indirect
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
github.com/prometheus/common v0.66.1 // indirect
github.com/prometheus/procfs v0.16.1 // indirect
github.com/rogpeppe/go-internal v1.15.0 // indirect
github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
go.yaml.in/yaml/v2 v2.4.2 // indirect
golang.org/x/sync v0.18.0 // indirect
golang.org/x/sys v0.41.0 // indirect
golang.org/x/text v0.31.0 // indirect
google.golang.org/protobuf v1.36.8 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)