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).
15 lines
957 B
Markdown
15 lines
957 B
Markdown
# env-var-proof
|
|
|
|
Answers one factual question with real execution instead of quoting a changelog: does Spring
|
|
Boot 4.1 actually honor standard `OTEL_*` environment variables that Boot 4.0 did not?
|
|
|
|
`boot40/` and `boot41/` contain the **identical** `OtelEnvProofApplication.java` -- the only
|
|
difference between the two Maven modules is the `spring-boot-starter-parent` version (4.0.8 vs
|
|
4.1.1). Both start with only `OTEL_EXPORTER_OTLP_ENDPOINT` and `OTEL_METRIC_EXPORT_INTERVAL` set
|
|
(no `management.otlp.*` Spring properties anywhere) and point at `stub-receiver/`, a
|
|
dependency-free stand-in for an OTLP collector that just logs every POST it receives.
|
|
|
|
See [`../docs/output/04-otel-env-vars-4.0-vs-4.1.txt`](../docs/output/04-otel-env-vars-4.0-vs-4.1.txt)
|
|
for the captured result, and [`../docs/03-otel-env-vars.md`](../docs/03-otel-env-vars.md) for the
|
|
write-up. Run it yourself with [`../scripts/run-env-var-proof.sh`](../scripts/run-env-var-proof.sh).
|