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apm: change default sampling.tail.storage_limit #4814

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apm: change default sampling.tail.storage_limit #4814

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apm: change default sampling.tail.storage_limit
carsonip Feb 3, 2025
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carsonip Feb 11, 2025
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carsonip Feb 11, 2025
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7 changes: 6 additions & 1 deletion docs/en/observability/apm/configure/sampling.asciidoc
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Expand Up @@ -67,9 +67,14 @@ This final policy is used to catch remaining trace events that don't match a str
=== Storage limit
The amount of storage space allocated for trace events matching tail sampling policies. Caution: Setting this limit higher than the allowed space may cause APM Server to become unhealthy.

A value of `0` or equivalent (e.g. `0GB`) means unlimited local tail sampling database size
but enforces a max 80% disk usage limit on the disk where the database is located,
i.e. the last 20% of disk will not be used by APM Server.
It is the recommended value as it automatically scales with the disk size by definition.

If the configured storage limit is insufficient, it logs "configured storage limit reached". The event will bypass sampling and will always be indexed when storage limit is reached.

Default: `3GB`. (text)
Default: `0`. (text)

|====
| APM Server binary | `sampling.tail.storage_limit`
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