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I'd like to use the Logstash Juju charm and was wondering how the log files are persisted. In other words, if I lose a Logstash instance will I still have access to past logs?

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Currently, there isn't much safe guard if you're just using the logstash-indexer charm with no datastore. However, if you add the elasticsearch charm to your logstash-indexer instance, then the data will instead be stored there. So if the indexer does go away, the data is still kept in elasticsearch and should still be reachable by Kabana or other means. However, if elasticsearch went away you'd be in the same situation as before, where the data wouldn't be available anymore.

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