You can flag messages of note in the Corpus and Log windows so that you can easily find them later. You can also log entries that you want to bring to the attention to custom support when you save a diagnostic report. Because you’ve identified flagged log entries as important, their data is not automatically pruned from the log.
You can flag rules in the Allowlist and Blocklist windows, e.g. to keep track of a rules that you’re observing or tweaking or that you’ve put on probation and may deactivate or delete.