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12 changes: 12 additions & 0 deletions solutions/observability/apm/tail-based-sampling.md
Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,18 @@ Synchronization interval for multiple APM Servers. Should be in the order of ten
| APM Server binary | `apm-server.sampling.tail.interval` |
| Fleet-managed | `Interval` |

### TTL [sampling-tail-ttl-ref]

Time-to-live (TTL) for trace events stored in the local storage of the APM Server during tail-based sampling. This TTL determines how long trace events are retained in the local storage while waiting for a sampling decision to be made. A greater TTL value increases storage space requirements. Should be at least 2 * Interval (`apm-server.sampling.tail.interval`).

Default: `30m` (30 minutes). (duration)

| | |
| --- | --- |
| APM Server binary | `apm-server.sampling.tail.ttl` |
| Fleet-managed {applies_to}`stack: ga 9.1` | `TTL` |


### Policies [sampling-tail-policies-ref]

Criteria used to match a root transaction to a sample rate.
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