Hi,

We metrics.2022-07-22T00-20-13Z-00000 replicaset, with 3 nodes. We were earlier on version 4.2
Average Response time: 1.5 ms
p55: 5ms

The version upgrade to 4.4 was done around 21st July 10:00 pm. Immediately after the upgrade we did not notice any issues, but after a few hours, we started 

seeing an increase in response time and a lot of slow queries on mongo side.
Average Response time: 3.5 ms
p55: 15ms

Data size: 5TB(uncompressed)
Index size: 35GB

We also observed the following:

• Increase in memory page faults
• Dirty data and dirty pages in cache
• Increase in blocks read
• Decrease in blocks written
• Increase in cache evictions
• Increase in cache pages read
• Decrease in cache pages written

Please find attached the screenshots and the diagnostic data.

Please help us in finding out the issue and suggest an appropriate fix for this.
Thanks in advance!metrics.2022-07-22T05-45-13Z-00000