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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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Consistency
carsonip Feb 11, 2025
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12 changes: 10 additions & 2 deletions docs/en/observability/apm/configure/sampling.asciidoc
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Expand Up @@ -67,9 +67,17 @@ 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.

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.
A value of `0GB` (or equivalent) does not set a concrete limit,
but rather allows the APM Server to align its disk usage with the disk size.
APM server uses up to 80% of the disk size limit on the disk where the local tail-based sampling database is located.
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.

Default: `3GB`. (text)
If this is not desired, a concrete `GB` value can be set for the maximum amount of disk used for tail-based sampling.

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

Default: `0GB`. (text)

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