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Update exemplar docs based on changes to exemplar storage configuration (#9868)

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* Update exemplar docs based on changes from #8974

Signed-off-by: Callum Styan <callumstyan@gmail.com>

* Fix missing code block closing + unindent one level.

Signed-off-by: Callum Styan <callumstyan@gmail.com>
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Callum Styan 2021-12-01 01:30:08 -08:00 committed by GitHub
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13
docs/configuration/configuration.md
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@ -95,6 +95,10 @@ remote_write:
# Settings related to the remote read feature.
remote_read:
[ - <remote_read> ... ]
# Storage related settings that are runtime reloadable.
storage:
[ - <exemplars> ... ]
```
### `<scrape_config>`
@ -2839,3 +2843,12 @@ tls_config:
There is a list of
[integrations](https://prometheus.io/docs/operating/integrations/#remote-endpoints-and-storage)
with this feature.
### `<exemplars>`
Note that exemplar storage is still considered experimental and must be enabled via `--enable-feature=exemplar-storage`.
```yaml
# Configures the maximum size of the circular buffer used to store exemplars for all series. Resizable during runtime.
[ max_exemplars: <int> | default = 100000 ]
```

2
docs/feature_flags.md
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@ -52,7 +52,7 @@ The remote write receiver allows Prometheus to accept remote write requests from
[OpenMetrics](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#exemplars) introduces the ability for scrape targets to add exemplars to certain metrics. Exemplars are references to data outside of the MetricSet. A common use case are IDs of program traces.
Exemplar storage is implemented as a fixed size circular buffer that stores exemplars in memory for all series. Enabling this feature will enable the storage of exemplars scraped by Prometheus. The flag `storage.exemplars.exemplars-limit` can be used to control the size of circular buffer by # of exemplars. An exemplar with just a `traceID=<jaeger-trace-id>` uses roughly 100 bytes of memory via the in-memory exemplar storage. If the exemplar storage is enabled, we will also append the exemplars to WAL for local persistence (for WAL duration).
Exemplar storage is implemented as a fixed size circular buffer that stores exemplars in memory for all series. Enabling this feature will enable the storage of exemplars scraped by Prometheus. The config file block [storage](configuration/configuration.md#configuration-file)/[exemplars](configuration/configuration.md#exemplars) can be used to control the size of circular buffer by # of exemplars. An exemplar with just a `traceID=<jaeger-trace-id>` uses roughly 100 bytes of memory via the in-memory exemplar storage. If the exemplar storage is enabled, we will also append the exemplars to WAL for local persistence (for WAL duration).
## Memory snapshot on shutdown