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clarify log level best practices

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Trent Mick 2012-09-10 12:13:31 -07:00
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README.md
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@ -227,20 +227,25 @@ in production.**
# Levels
The log levels in bunyan are:
The log levels in bunyan are as follows. The level descriptions are best
practice *opinions*.
- "fatal" (60): the service/app is going to stop or become unusable now
- "error" (50): fatal for a particular request, but the service/app continues servicing other requests
- "warn" (40): a note on something that should probably be looked at by an operator
- "info" (30): detail on regular operation
- "debug" (20): anything else, i.e. too verbose to be included in "info" level.
- "trace" (10): logging from external libraries used by your app
- "fatal" (60): The service/app is going to stop or become unusable now.
An operator should definitely look into this soon.
- "error" (50): Fatal for a particular request, but the service/app continues
servicing other requests. An operator should look at this soon(ish).
- "warn" (40): A note on something that should probably be looked at by an
operator eventually.
- "info" (30): Detail on regular operation.
- "debug" (20): Anything else, i.e. too verbose to be included in "info" level.
- "trace" (10): Logging from external libraries used by your app or *very*
detailed application logging.
General level usage suggestions: "debug" should be used sparingly.
Information that will be useful to debug errors *post mortem* should usually
be included in "info" messages if it's generally relevant or else with the
corresponding "error" event. Don't rely on spewing mostly irrelevant debug
messages all the time and sifting through them when an error occurs.
Suggestions: Use "debug" sparingly. Information that will be useful to debug
errors *post mortem* should usually be included in "info" messages if it's
generally relevant or else with the corresponding "error" event. Don't rely
on spewing mostly irrelevant debug messages all the time and sifting through
them when an error occurs.
Integers are used for the actual level values (10 for "trace", ..., 60 for
"fatal") and constants are defined for the (Logger.TRACE ... Logger.DEBUG).