Monitoring & Observability

A wrap around Prometheus, Grafana, OpenTelemetry and Langfuse, not a re-teaching of them. This
skill carries OrchestKit's delta (version floors, house decisions, scars) and points at the
vendor for everything else. Start at references/ork-delta.md.

Upstream coverage (do not restate)

These topics are fully covered first-party. Read the source, do not add a local copy.

Quick Reference

Total: 5 rules across 3 categories. Drift detection, cost tracking, eval scoring, Prometheus
instrumentation and alert-rule authoring moved to the upstream sources listed above.

Quick Start

# Langfuse v4 LLM tracing: semantic as_type plus inline scoring
from langfuse import observe, get_client

@observe(as_type="generation", name="analyze_content")
async def analyze_content(content: str):
    get_client().update_current_trace(
        user_id="user_123", session_id="session_abc",
        tags=["production", "orchestkit"],
    )
    result = await llm.generate(content)
    get_client().score_current_span(name="response_quality", value=0.85)
    return result

# Prometheus RED method, wired the way this repo expects (bounded labels only)
from prometheus_client import Counter, Histogram

http_requests = Counter('http_requests_total', 'Total requests', ['method', 'endpoint', 'status'])
http_duration = Histogram('http_request_duration_seconds', 'Request latency',
    buckets=[0.01, 0.05, 0.1, 0.5, 1, 2, 5])

Infrastructure Monitoring

Dashboard and health-check patterns. Metric instrumentation and alert-rule syntax are upstream.

CC 2.1.161 — OTEL resource attributes as metric labels: OTEL_RESOURCE_ATTRIBUTES values are now attached as labels on metric datapoints, so usage metrics can be sliced by custom dimensions (team, repo, environment). Add label selectors to dashboards for multi-tenant / per-team cost and usage tracking.

LLM Observability

Langfuse-based tracing for LLM applications. Cost tracking, scoring and drift statistics are
upstream; what stays here is how this repo wires traces.

Silent Failures

Detection and alerting for silent failures in LLM agents.

CC 2.1.169 — OTEL client-cert paths require trust: untrusted project settings can no longer set OTEL client-certificate paths without a trust confirmation. If your OTEL exporter uses client certs configured in project .claude/settings.json, expect a one-time trust prompt on first use in an untrusted project — telemetry silently not flowing after 2.1.169 is usually this gate, not the collector.

Key Decisions

Detailed Documentation

Related Skills

• defense-in-depth - Layer 8 observability as part of security architecture
• devops-deployment - Observability integration with CI/CD and Kubernetes
• resilience-patterns - Monitoring circuit breakers and failure scenarios
• llm-evaluation - Evaluation patterns that integrate with Langfuse scoring
• caching - Caching strategies that reduce costs tracked by Langfuse