'WARN [io.undertow.request] (default I/O-42) UT005073: Thread default task-57466 (id=7761157) was previously reported to be stuck but has completed

We are getting below error frequently and app is responding slow / not accessible when this warning logs. we tried many ways to find the cause but nothing worked. Need some help here to find reason for thread stuck

WARN [io.undertow.request] (default I/O-42) UT005073: Thread default task-57466 (id=7761157) was previously reported to be stuck but has completed. It was active for approximately 488709 milliseconds. There is/are still 3 thread(s) that are monitored by this Valve and may be stuck



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