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docs: [VictoriaLogs] OTel Collector elasticsearchexporter header note (#7074)

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### Describe Your Changes

By default, the `elasticsearchexporter` in OTel Collector puts the log
message under a field other than `_msg` (e.g., `Body`). Without
specifying via an HTTP header, those logs may not be queried correctly.
See also:
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6785.

This pull request updates the example configuration and notes for the
`elasticsearchexporter`.

### Checklist

The following checks are **mandatory**:

- [X] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).
This commit is contained in:
Zhu Jiekun 2024-09-24 17:52:09 +08:00 committed by GitHub
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11
docs/VictoriaLogs/data-ingestion/opentelemetry.md
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@ -56,6 +56,8 @@ exporters:
elasticsearch:
endpoints:
- http://victorialogs:9428/insert/elasticsearch
headers:
VL-Msg-Field: "Body" # Optional.
receivers:
filelog:
include: [/tmp/logs/*.log]
@ -68,6 +70,15 @@ service:
exporters: [elasticsearch]
```
Please note that every ingested log entry **must** contain at least a `_msg` field with the actual log message. By default,
the Elasticsearch exporter may place the log message in the `Body` field. In this case, you can specify the field mapping via:
```yaml
headers:
VL-Msg-Field: "Body"
```
VictoriaLogs also support specify `AccountID`, `ProjectID`, log timestamp and other fields via [HTTP headers](https://docs.victoriametrics.com/victorialogs/data-ingestion/#http-headers).
### Loki
```yaml