wu-sheng opened a new pull request, #13742:
URL: https://github.com/apache/skywalking/pull/13742
### Introduce LogMetadata POJO to separate metadata from input data in LAL
pipeline
Cleanly decouple metadata (service, layer, timestamp, trace context) from
input data
(LogData body/tags, typed protos like Envoy ALS) at the LAL pipeline entry
point.
**Key changes:**
- `LogMetadata` POJO carries service/instance/endpoint/layer/timestamp/trace
context
- `LogMetadataUtils.fromLogData()` extracts metadata from `LogData` at
receiver boundary
- `ExecutionContext` uses `metadata()` + `input()` instead of `log()` +
`extraLog()`
- Envoy ALS receivers no longer build fake `LogData` — pass typed proto as
`input` directly
- `LogSinkListener.parse()` unified to single 3-parameter signature
`(LogMetadata, Object, ExecutionContext)`
- `LogTestQuery` (test tool) separated from production sink via `dryRun` flag
- Only compiler is LogData-aware (for `json{}`/`yaml{}` fallback); runtime
uses untyped `ctx.input()`
- `LalRuntimeHelper.tagValue()` casts directly to `LogData.Builder` (no
instanceof guard — only called by compiled code)
- [ ] If this pull request closes/resolves/fixes an existing issue, replace
the issue number. Closes #<issue number>.
- [ ] Update the [`CHANGES`
log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).
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