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docs: add kernel version-specific selector limits #4553

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mtardy merged 1 commit into from
Jan 23, 2026
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docs: add kernel version-specific selector limits #4553

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3 changes: 3 additions & 0 deletions docs/content/en/docs/concepts/tracing-policy/selectors.md
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Expand Up @@ -2052,6 +2052,9 @@ exist.
- Max MatchArgs per selector 5 (one per index)
- Max MatchArg Values per MatchArgs 4 (for operators like `Equal`, `NotEqual`,
`GT`, `LT`, etc.)
- Max file match values (using `fd` or `file` arg): 8 on kernels ≥5.3, 2 on kernels <5.3
- String prefix max length: 256 chars
- String postfix max length: 128 chars

For an unlimited number of values, consider using the `InMap` or `NotInMap`
operators which store values in a BPF map.
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