Hi,
Have got this message in logger after upgrade to 8.1.20…
Anyone now why I got this message, and how can i fix it 
Best regards Stian
Is this log entry spamming your logs, making it difficult from seeing other logs, or is it infrequent?
That log doesn’t really seem to pose an issue to me to be honest. It is an INFO log, not a WARNING or ERROR, and all it is saying is that the idle threads in the thread pool are getting cleaned up. Perhaps it was added as a new log to 8.1.20. I personally wouldn’t worry about it, unless it is spamming your logs.
There is a feature with 8.1.20 that introduces per-datasource thread pools for DB query tags. Every minute it will clean up any idle thread pools if there are no scheduled queries. I can imagine certain situations where that could be occurring more often than desired (i.e. if there are only commanded queries instead of scheduled). You can customize the timing of that cleanup operation via the system property ignition.tags.db_tag_threads_min_cleanup_time, where the default is 60000ms (every minute). Setting to 0 will disable the cleanup entirely.
Yes, this INFO message is spamming my log. There is a new entry every minute.
You can set the log level to OFF in the gateway, but we’re changing the level to DEBUG in 8.1.21 (along with fixing another bug related to this).
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This INFO message is referring to tag group default/Default, but I don’t have a query tag using this group. I did find the tag causing this, when changing the execution mode from tag group to fixed rate the INFO message stopped.