feat(logging): enhance JSON logging fields#129
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TheMeinerLP
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Jun 20, 2026
TheMeinerLP
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- build: add OpenTelemetry and JSON-logging dependencies
- feat(logging): structured JSON logging for Grafana Loki
- feat(tracing): configure OpenTelemetry OTLP export
- feat(logging): enhance JSON logging fields for improved structure and readability
Add the version-catalog entries (settings.gradle.kts) and wire them into
the backend: micronaut-tracing-opentelemetry http/jdbc, the OTLP exporter,
logstash-logback-encoder, the OpenTelemetry logback MDC appender and janino.
Also disable the AOT replaceLogbackXml optimization so logback.xml is parsed
at runtime, which the env-driven JSON/plain switch and ${...} substitution
in the optimized (Docker/prod) jar depend on.
Switch logback to emit structured JSON on stdout when LOG_JSON=true (set in the Docker/prod container) so Loki can index the fields; local dev keeps the human-readable pattern. Wrap the appender with the OpenTelemetry MDC appender so each line carries trace_id/span_id for log <-> trace correlation.
Add the otel config block: tracing is disabled by default (exporter "none") and activates when OTEL_TRACES_EXPORTER=otlp is set, exporting spans over OTLP gRPC to the configured endpoint. Metrics stay on Prometheus/Micrometer, and health/prometheus/swagger paths are excluded from tracing.
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