Claude
03bdf7ee87
Companion module for the rewritten ankurm.com Prometheus/Grafana monitoring post. Verified against a real running grafana/otel-lgtm container (not mocked): 8 real requests produce a real orders_placed_total metric queried back from the bundled Prometheus-compatible API with zero management.otlp.* properties, auto-wired entirely by Boot's Docker Compose service-connection detection. Two real findings surfaced along the way and documented rather than smoothed over: @Observed silently produces no span without an explicit ObservedAspect bean (AspectJ weaving alone is not sufficient, despite Micrometer Tracing being active), and OTEL_EXPORTER_OTLP_ENDPOINT already worked on Boot 4.0 via Micrometer's own OtlpConfig fallback -- what's actually new in 4.1 is the rest of the standard OTEL_* surface (verified with OTEL_METRIC_EXPORT_INTERVAL against identical source compiled on both Boot 4.0.8 and 4.1.1). Also fixes the root README's module table, which was missing a row for resilience4j-circuit-breaker (added in a previous commit but never indexed here).
25 lines
1.6 KiB
Plaintext
25 lines
1.6 KiB
Plaintext
$ mvn spring-boot:run
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...
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DockerComposeLifecycleManager : Using Docker Compose file /tmp/obs-module/compose.yaml
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DockerCli : Network obs-module_default Creating
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DockerCli : Network obs-module_default Created
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DockerCli : Container obs-module-lgtm-1 Creating
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DockerCli : Container obs-module-lgtm-1 Created
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DockerCli : Container obs-module-lgtm-1 Starting
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DockerCli : Container obs-module-lgtm-1 Started
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DockerCli : Container obs-module-lgtm-1 Waiting
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DockerCli : Container obs-module-lgtm-1 Healthy
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...
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PushMeterRegistry : Publishing metrics for OtlpMeterRegistry every 1m to http://127.0.0.1:4318/v1/metrics with resource attributes {service.name=order-service}
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Started ObservabilityApplication in 34.426 seconds (process running for 34.652)
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$ docker ps
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CONTAINER ID IMAGE COMMAND STATUS PORTS NAMES
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4f768a81a102 grafana/otel-lgtm:latest "/otel-lgtm/run-all...." Up 46 seconds (healthy) 0.0.0.0:3000->3000/tcp, 0.0.0.0:3200->3200/tcp, 0.0.0.0:4317-4318->4317-4318/tcp, 0.0.0.0:9090->9090/tcp obs-module-lgtm-1
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No management.otlp.* property was set anywhere in application.yml or on the command line for
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this run. The endpoint (127.0.0.1:4318) came entirely from Boot's Docker Compose service
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connection detecting the grafana/otel-lgtm image named in compose.yaml. Note the literal
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"127.0.0.1" -- a plain default (no compose.yaml, no service connection) reports "localhost" for
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this same port instead; that difference is the tell for whether auto-wiring actually happened.
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