Developer self-pentests AI observability hub, finds critical config flaws in own code

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A developer conducted a read-only security audit of a personal AI-assisted coding observability hub built with six services, including OpenTelemetry Collector, Prometheus, Grafana, and Loki. Rather than testing live infrastructure, the audit was performed locally in Docker to avoid costs and data pollution. The review found that most serious vulnerabilities were in recently written code — not legacy components — including a flaw where Claude Code was leaking real user email addresses as Loki index labels due to incomplete telemetry filtering. Scope attributes were found to bypass both the Collector and Loki's allow-list controls, which had been incorrectly documented as independent barriers. A separate bug caused a trace ID sanitization rule to silently fail on every log record, allowing unredacted trace IDs to reach storage undetected.

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