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Nanaloveyuki
75 lines
2.0 KiB
Markdown
75 lines
2.0 KiB
Markdown
---
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name: configured-logger-file-rotation-failures
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group: api
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category: runtime
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update-time: 20260512
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description: Read the number of rotation failures recorded by the configured runtime file sink.
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key-word:
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- logger
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- runtime
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- file
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- public
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---
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## Configured-logger-file-rotation-failures
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Read the number of rotation failures recorded by a `ConfiguredLogger` file sink. This helper is useful when runtime rotation behavior should be observed operationally.
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### Interface
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```moonbit
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pub fn ConfiguredLogger::file_rotation_failures(self : ConfiguredLogger) -> Int {}
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```
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#### input
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- `self : ConfiguredLogger` - Config-driven runtime logger 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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- File-backed sinks report their recorded rotation-failure count.
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- Queued file sinks forward the metric from the wrapped file sink.
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- Non-file sinks return `0`.
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- The counter is cumulative until reset.
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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 rotation is failing:
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```moonbit
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let count = logger.file_rotation_failures()
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```
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In this example, the configured logger 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(logger.file_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 the configured sink is not file-backed, the method returns `0`.
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- If callers need both rotation config and failure metrics, they should combine this helper with `file_rotation_config()` or `file_state()`.
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### Notes
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1. Use this helper when diagnosing file rotation reliability.
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2. It is especially relevant when runtime rotation policy can change after startup.
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