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apm: change default sampling.tail.storage_limit #581

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Feb 24, 2025
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apm: change default sampling.tail.storage_limit #581

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10 changes: 7 additions & 3 deletions solutions/observability/apps/transaction-sampling.md
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Expand Up @@ -264,9 +264,13 @@ Policies map trace events to a sample rate. Each policy must specify a sample ra

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)

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Expand Down Expand Up @@ -301,4 +305,4 @@ The service name for events to match a policy. (string)

##### **`service.environment`** [sampling-tail-service-environment-{{input-type}}]

The service environment for events to match a policy. (string)
The service environment for events to match a policy. (string)