Add explicit stream config to logging handlers for env var override #19860
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The logging configuration override system only allows overriding keys that already exist in logging.yml. This adds explicit `stream: ext://sys.stderr` to the console and debug handlers, preserving the current default behavior while enabling users to redirect logs to stdout via environment variable: PREFECT_LOGGING_HANDLERS_CONSOLE_STREAM=ext://sys.stdout This is useful in containerized environments (e.g., Kubernetes) where stdout and stderr may be handled differently by log aggregation systems. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Summary
stream: ext://sys.stderrto theconsoleanddebughandlers inlogging.ymlProblem
The logging configuration override system (in
configuration.py) only allows overriding keys that already exist inlogging.yml. Sincestreamwas not defined, users couldn't redirect logs viaPREFECT_LOGGING_HANDLERS_CONSOLE_STREAM.Solution
By adding the explicit
streamkey with the current default (ext://sys.stderr), users can now override it:This is particularly useful in containerized environments (e.g., Kubernetes) where stdout and stderr may be handled differently by log aggregation systems.
Test plan
PREFECT_LOGGING_HANDLERS_CONSOLE_STREAM=ext://sys.stdout🤖 Generated with Claude Code