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Filters can be employed in logging in the following ways:

1. Level-based filtering: This involves specifying the minimum severity level of logs that will be recorded. For example, if the minimum level is set to "debug," only logs with a severity level of "debug" or higher will be recorded.

2. Keyword-based filtering: This involves specifying specific keywords or phrases that should be included or excluded from the logs. For example, if the keyword "ERROR" is included, only logs that contain the word "ERROR" will be recorded.

3. Context-based filtering: This involves filtering logs based on the context in which they were generated. For example, you could filter logs based on the user who was logged in, the module or application being used, or the location of the log event.

4. Time-based filtering: This involves specifying a time range for which logs should be recorded. For example, you could specify that logs should only be recorded between 8am and 5pm on weekdays.

Filters can help reduce the amount of data that needs to be stored or analyzed, making it easier to focus on what is important.