It's very good you are monitoring the dashboard, this is what we use to judge issues as well (looking for anomolies or changes in behavior).
Looking at historical information in the second dashboard, I would say that this is a problem.
The avg request processing time seems to have jumped to higher than normal levels recently.
I would guess this might be related to the problem talked about here:
See my comment in that post below:
Enabled Rule Action Events Comments [✔] Enabled Check Proxy-Authorization Header for Bad Credentials
1: Header.Request.Exists("Proxy-Authorization") equals true
2: AND Header.Request.Get("Proxy-Authorization") equals "Basic Tm9uZTpOb25l"
Attached is the described rule.
This would be placed inside of Direct Proxy Authenticatin and Authorization at the top level, see screenshot below:
from my side, i would also add an event to set the authentication.username to a specific name.
This makes reporting much more easier. :-)