Observability
Sources: Antigravity, 2026-07-05 Raw: Observability Source
Observability
Three pillars — Logs (diary), Traces (narrative), Metrics (timing) — plus clinical audit events. All output passes through config.redact_secrets() before emission.
| Pillar | Implementation | Purpose |
|---|---|---|
| Logs | setup_logging() — structured JSON |
Machine-parseable, searchable audit trail |
| Traces | setup_tracing() — OpenTelemetry OTLP/GCP |
Distributed request tracing |
| Clinical events | log_clinical_event() |
Privacy-aware audit: patient access, PHI redaction, review decisions |
Key functions (observability.py)
| Function | Purpose |
|---|---|
setup_logging(level) |
Structured JSON logger |
setup_tracing() |
OTLP exporter — opt-in via ENABLE_TRACING; TRACE_EXPORTER=gcp routes to Cloud Trace |
log_tool_call(name, args, result, duration_ms) |
Redacted tool audit with timing |
log_security_event(event_type, details) |
Audit trail for every block/detection ([[Security Layers]]) |
log_clinical_event(...) |
Clinical audit events |
timed_operation(name) |
Context manager measuring operation duration |
Logging and tracing initialize at import time in agent.py. Tracing degrades gracefully: missing OTel packages or ENABLE_TRACING=FALSE means the agent runs normally without traces.
Plugins (attached via app.py → App(..., plugins=build_plugins()))
| Plugin | Purpose |
|---|---|
LoggingPlugin (ADK built-in) |
Verbose request/response tracing |
ObservabilityPlugin |
Redacted lifecycle logging + token-budget estimates |
ClinicalAuditPlugin |
Patient-data access tracking + per-turn PHI metrics |
[!note] Rule No
print()statements in agent code — structured JSON logging viaobservability.pyonly. Harness scripts underscripts/are exempt.
Related: [[Security Layers]] · [[System Overview]] (Cloud Trace / Cloud Logging mapping)