trait LogKey extends AnyRef
All structured logging keys used in MDC must be extends LogKey
LogKeys serve as identifiers for mapped diagnostic contexts (MDC) within logs.
Follow these guidelines when adding a new LogKey:
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Define all structured logging keys in LogKey.scala, and sort them alphabetically for
ease of search.
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Use UPPER_SNAKE_CASE for key names.
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Key names should be both simple and broad, yet include specific identifiers like STAGE_ID,
TASK_ID, and JOB_ID when needed for clarity. For instance, use MAX_ATTEMPTS as a
general key instead of creating separate keys for each scenario such as
EXECUTOR_STATE_SYNC_MAX_ATTEMPTS and MAX_TASK_FAILURES.
This balances simplicity with the detail needed for effective logging.
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Use abbreviations in names if they are widely understood,
such as APP_ID for APPLICATION_ID, and K8S for KUBERNETES.
- For time-related keys, use milliseconds as the unit of time.
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(Since version 9)