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Logging

For logging use the Log struct provided in the log package (see pkg/log). That struct offers several functions for providing logs with different log levels, verbosity and content.

Log Levels and Verbosity

The Log struct offers several functions for logging with a decent log level: Info(msg), Warning(msg), Error(msg), Critical(msg). These functions also exist in a second flavor, where you can use a formatted string with additional arguments.

Additionally you can set the verbosity with V(verbosity), which takes effect on info level messages.

Please check the Kubernetes Logging Conventions for the meaning of the different log levels and verbosity.

During runtime you will see:

  • all info logs with a verbosity equal or lower to verbosity set by the -v command line flag
  • all warning, error and critical logs

Default values

If you don't set a verbosity for your info log statements, they will use the default value of 2.

Also, if you don't provide a -v command line flag, it will use a default of 2.

Enhancing logs

You can enhance the log statements with some helper functions:

  • Object(o): o has to be a Kubernetes resource, this will log the name, namespace, kind and uuid of the resource
  • With(...keyvals): logs the given key / value pairs
  • Reason(err): short for With("reason", err)
  • Key(name, kind): short for With("name", name, "kind", kind), where given name can be in format namespace/name