In production environments we want to have full control of the data we are collecting, filtering is an important feature that allows us to alter the data before delivering it to some destination.
Filtering is implemented through plugins, so each filter available could be used to match, exclude or enrich your logs with some specific metadata.
Very similar to the input plugins, Filters run in an instance context, which has its own independent configuration. Configuration keys are often called properties.
For more details about the Filters available and their usage, please refer to the Filters section.