observability-best-practices

Python observability best practices using OpenTelemetry — SDK bootstrap with off-switch contract and idempotency guard, auto-instrumentation (gRPC/SQLAlchemy/FastAPI/Logging), the LoggingInstrumentor + structlog correlation pattern with custom log hook and CleanLoggingHandler, two-tier log field taxonomy, span attribute conventions with <service>.<key> prefix for cross-service Tempo search, sensitive-field redaction at the serialization boundary, status taxonomy, metrics cardinality control, tail-based sampling, and Sentry-with-OTel integration