Companion module for the ankurm.com article Spring Boot 4.2 OpenTelemetry: Semantic Conventions, Shared OTLP Settings and MDC Keys. Everything runs against Spring Boot 4.2.0-RC1 (a release candidate, not GA) and against 4.1.2 (GA) as the baseline. JDK 25.

Path	What it is
`pom.xml` / `pom-41.xml`	the same project on 4.2.0-RC1 and on 4.1.2
`src/main/.../OtelApplication`	one endpoint, `GET /hello/{name}`, that logs a line
`src/test/.../OtlpSink`	a 60-line OTLP/HTTP receiver: records path, headers and payload strings of every export request
`src/test/.../ConventionsTest`	meters and span names for each `management.observations.conventions` value, including the start-up failure RC1 gives for `open-telemetry`
`src/test/.../ConventionSpellingsTest`	seven spellings of the conventions value, each started for real: which start and which meter they produce
`src/test/.../SharedOtlpTest`	`management.opentelemetry.otlp.*`: paths, merged headers, gzip, and signal-specific overrides
`src/test/.../MdcAndLongTaskTimerTest`	custom MDC keys, and the active-observation LongTaskTimer that is no longer on by default
`src/test/.../PrometheusNamesTest`	the `http_server_*` names a dashboard query sees under each convention
`output/`	every transcript quoted in the article; `./scripts/run-all.sh` regenerates them

Run: ./scripts/run-all.sh. ConventionsTest pins the RC1 behaviour on purpose; when a later build changes it, that test fails and the article needs updating.

There is deliberately no docs/ folder: the explanations live in the article.