Thoughput on application started to act up. the response time did not change under usual load, while I do notice that amount of passed transactions is lower.
there is no failures I can see.
I am wondering what could be a reason and ways to troubleshoot the issue.
we are running 3 IIS servers on load balancing , Oracle, Unix server for hosting proprietary app. I am attaching a screenshot and will appreciate ideas where to start looking.