asmhatre/spring-boot-demo
1
0
Fork 0
Code Activity

Add boot42-otel module: Spring Boot 4.2.0-RC1 OpenTelemetry conventions, shared OTLP settings and MDC keys vs 4.1.2

Browse Source
This commit is contained in:
asmhatre
2026-10-22 18:37:10 +00:00
parent 917d39fb65
commit 8252cba4c5
29 changed files with 958 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
README.md
+1
View File
@@ -46,6 +46,7 @@ files.
| [`project-structure/`](project-structure) | [Spring Boot Project Structure: Package-by-Layer vs Package-by-Feature](https://ankurm.com/spring-boot-project-structure/) | the same application written package-by-layer and package-by-feature with one HTTP API, the real source trees, 9 of 9 types public by layer vs 3 of 15 by feature, and the `javac` error that makes a feature boundary a compiler rule instead of a convention |
| [`crud-mysql/`](crud-mysql) | [Spring Boot CRUD REST API with MySQL and Spring Data JPA](https://ankurm.com/spring-boot-crud-rest-api-mysql/) | a complete book API on a real MySQL 8.4.6 server with Flyway owning the schema and Hibernate set to `validate`, `ProblemDetail` errors with per-field validation messages, a duplicate ISBN caught by the database's unique key and mapped to `409` on create and on update, MySQL's own `Duplicate entry` message, and the SQL behind every request |
| [`boot42-rc1-checklist/`](boot42-rc1-checklist) | [Spring Framework 7.1 and Spring Boot 4.2: What's Coming and How to Prepare](https://ankurm.com/spring-boot-4-2-spring-framework-7-1-upgrade-checklist/) | each 4.2 milestone change run on 4.2.0-RC1 and on 4.1.2: `@DefaultValue` placeholders resolved, five new Kafka admin keys that 4.1.2 silently ignores, embedded LDAP SSL failing without a bundle, the properties migrator's real report (and the removed key it misses), and the `RestTemplate` removal warnings from the compiler |
| [`boot42-otel/`](boot42-otel) | [Spring Boot 4.2 OpenTelemetry: Semantic Conventions, Shared OTLP Settings and MDC Keys](https://ankurm.com/spring-boot-4-2-opentelemetry-semantic-conventions-shared-otlp-mdc/) | one request measured under each `management.observations.conventions` value (the documented `open-telemetry` fails to start on RC1, `opentelemetry` works), meter, span and Prometheus names before and after, `management.opentelemetry.otlp.*` verified against a local OTLP receiver (paths, merged headers, gzip, per-signal overrides), custom MDC keys, and the LongTaskTimer that is no longer on by default |
`core-di`, `core-beans`, `custom-starter`, `core-events`, `multi-datasource`, `i18n`, `aot-cache`, `kotlin`, `testing-no-containers`, `rest-test-client` and `hexagonal` are the exception: they have **no `docs/NN-topic.md` chapter folder**. Their deeper material lives in
collapsible sections inside the articles themselves. Where their captured output sits is not