Key Changes

• Set a policy for changes to the default format
• Make all dependencies besides log optional (but enabled by default)

Breaking Changes

• The default format is not considered stable across patch versions. The best way to get a stable format for later ripgrepping is to define a custom one.
• All dependencies have been made optional except for log. That means compiling env_logger with default-features=false will result in a different experience than in 0.5.x.

Contributions

• @hcpl Test with -Z minimal-versions on CI
• @afck Add missing RFC3339 URL to fix rustdoc
• Make all dependencies optional
• Rework the default format
• Don't clobber a previously set level filter

More Details

Disabling dependencies

Using default-features=false will disable all dependencies of env_logger besides log. This will reduce compile times and alter the default format by disabling colours and timestamps.

Disabling default dependencies is the recommended way to use env_logger for libraries that only need it for logging in tests.