test(obs): tighten missing-key test hygiene per gemini review

[bootjp]

• Log rdb.Close error instead of silently discarding it.
• Gate dumpErrorMetrics behind the assertion failure so the happy path does not pay for an extra Gather of every metric family.
• Short-circuit the three per-metric-family loops with a shared metricFamily() helper; missing families yield zero without a second Gather(), replacing the redundant testutil.GatherAndCount precheck.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: b466a413-03dd-48a6-aa8a-5043f086a648

📥 Commits

Reviewing files that changed from the base of the PR and between bee7ead and 804dea0.

📒 Files selected for processing (2)

• adapter/redis_metrics_missing_key_test.go
• go.mod

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch obs/redis-key-not-found-not-error

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[bootjp]

Addressed Gemini medium-priority items from the review of the #595 series:

• rdb.Close() error now logged via t.Logf instead of discarded.
• dumpErrorMetrics is gated behind the assertion-failure branch so the happy path does not pay for an extra Gather() each iteration.
• Two per-metric-family loops previously kept scanning after finding the target family; extracted a shared metricFamily(mfs, name) *dto.MetricFamily helper and short-circuit at the first match. Three call sites refactored.
• Removed the redundant testutil.GatherAndCount precheck in countErrorMetrics — the manual loop already handles a missing family by producing zero.

Verified:

• go test -race ./adapter/... -run TestRedisMetrics_MissingKeyNotCountedAsError -count=3 → 3/3 pass.
• golangci-lint run ./adapter/... → 0 issues.

/gemini review
@codex review

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