butterfly-520-boy opened a new pull request, #4439:
URL: https://github.com/apache/hertzbeat/pull/4439
## What's changed?
HTTP request bodies currently cannot generate a UUID for use by subsequent
metrics. Add `{{v4uuid}}` substitution in `http.payload`, including bodies
supplied through monitoring parameters.
Generate one UUID v4 at the start of each collection cycle and reuse it
across the cycle's HTTP metrics. Each subsequent cycle gets a new value. The
UUID remains collector-local and is excluded from job serialization. Copy the
task configuration when resolving the payload so the stored template and shared
subtask state remain intact.
Existing static parameters and previous-metric token substitutions retain
their behavior. This proposal limits UUID substitution to HTTP payloads;
headers, URLs and other template fields are unchanged. Add English and Chinese
examples to the HTTP token tutorial.
Fixes #3032.
## Validation
- 26 related tests pass, including five new regression tests.
- A local HTTP server records actual request bodies to verify same-cycle
reuse, next-cycle refresh, repeated occurrences, parameter-supplied bodies and
compatibility with previous-metric token substitution.
- Tests also verify template preservation, subtask state, unchanged ordinary
payloads and job serialization.
- Checkstyle: 0 violations.
- The updated Markdown and embedded YAML/JSON examples parse successfully. A
full documentation-site build was not run.
```text
./mvnw -pl hertzbeat-collector/hertzbeat-collector-collector -am
-Dtest=DynamicUuidCollectionTest,MetricsCollectTest,CommonDispatcherTest,CollectUtilTest,JobTest
-Dsurefire.failIfNoSpecifiedTests=false test
```
## Checklist
- [x] I have read the [Contributing
Guide](https://hertzbeat.apache.org/docs/community/code_style_and_quality_guide).
- [x] I have written the necessary documentation and comments.
- [x] I have added the necessary tests and all cases have passed.
## Add or update API
No public endpoint or dependency changes. The new runtime UUID field is
excluded from job JSON.
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