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[8.8] docs: Add tail-based sampling common problem (backport #11662) #11681

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Sep 25, 2023
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[8.8] docs: Add tail-based sampling common problem (backport #11662) #11681

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docs: Add tail-based sampling common problem (#11662)
carsonip Sep 20, 2023
325a5e4
Merge branch '8.8' into mergify/bp/8.8/pr-11662
mergify[bot] Sep 25, 2023
de45c34
Merge branch '8.8' into mergify/bp/8.8/pr-11662
mergify[bot] Sep 25, 2023
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11 changes: 11 additions & 0 deletions docs/common-problems.asciidoc
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Expand Up @@ -8,6 +8,7 @@ This section describes common problems you might encounter when using a Fleet-ma
* <<common-ssl-problems>>
* <<io-timeout>>
* <<field-limit-exceeded-legacy>>
* <<tail-based-sampling-memory-disk-io>>

[float]
[[no-data-indexed]]
Expand Down Expand Up @@ -187,3 +188,13 @@ In the agent logs, you won't see a sign of failures as the APM server asynchrono
----
{\"type\":\"illegal_argument_exception\",\"reason\":\"Limit of total fields [1000] in [INDEX_NAME] has been exceeded\"}
----

[[tail-based-sampling-memory-disk-io]]
[float]
=== Tail-based sampling causing high system memory usage and high disk IO

Tail-based sampling requires minimal memory to run, and there should not be a noticeable increase in RSS memory usage.
However, since tail-based sampling writes data to disk,
it is possible to see a significant increase in OS page cache memory usage due to disk IO.
If you see a drop in throughput and excessive disk activity after enabling tail-based sampling,
please ensure that there is enough memory headroom in the system for OS page cache to perform disk IO efficiently.