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Nanaloveyuki
74 lines
1.8 KiB
Markdown
74 lines
1.8 KiB
Markdown
---
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name: file-sink-rotation-failures
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group: api
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category: sink
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update-time: 20260613
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description: Read the number of rotation failures recorded by a FileSink.
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key-word:
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- file
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- sink
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- rotation
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- public
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---
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## File-sink-rotation-failures
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Read the number of rotation failures recorded by a `FileSink`. This helper is useful when direct runtime rotation behavior should be observed operationally.
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### Interface
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```moonbit
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pub fn FileSink::rotation_failures(self : FileSink) -> Int {
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```
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#### input
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- `self : FileSink` - File sink whose rotation-failure counter should be inspected.
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#### output
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- `Int` - Number of recorded rotation failures.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- The sink reports its recorded rotation-failure count directly.
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- The counter is cumulative until reset.
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- This helper is observation-only and does not mutate sink state.
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### How to Use
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Here are some specific examples provided.
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#### When Need Rotation-specific Diagnostics
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When support output should reveal whether direct sink rotation is failing:
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```moonbit
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let count = sink.rotation_failures()
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```
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In this example, the concrete file sink exposes a focused metric for rotation-path health.
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#### When Validate Runtime Rotation Tuning
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When changed rotation settings should be checked in operation:
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```moonbit
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ignore(sink.rotation_failures())
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```
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In this example, callers can observe whether runtime rotation changes introduced problems.
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### Error Case
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e.g.:
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- If callers need both rotation config and failure metrics, they should combine this helper with `rotation_config()` or `state()`.
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- This counter alone does not say whether the sink is currently available.
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### Notes
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1. Use this helper when diagnosing direct file rotation reliability.
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2. It is especially relevant when runtime rotation policy can change after startup.
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