jvgutierrez opened a new issue, #9028:
URL: https://github.com/apache/trafficserver/issues/9028
After updating to ATS 9.1.2 we have detected an increase on self-reported
metrics by ATS. On both 8.x and 9.x instances TTFB is gathered with
`%<{TS_MILESTONE_UA_BEGIN_WRITE-TS_MILESTONE_SM_START}msdms>`. As it can be
seen in this dashboard:
TTFB as reported by ATS has increased ~25% while ATS reported by the varnish
instances that feed traffic to ATS remained basically the same.
We've also detected some differences on reported plugin time, we log total
plugin time on both 8.x and 9.x instances with
`%<{TS_MILESTONE_PLUGIN_TOTAL-TS_MILESTONE_SM_START}msdms>`. ATS 8.x instances
almost always report a total plugin time of 0ms:
```
vgutierrez@cp6015:~$ curl -s http://127.0.0.1:3904/metrics |egrep
"total_plugin_time_(sum|count)" |grep appservers-rw
trafficserver_backend_total_plugin_time_sum{backend="appservers-rw.discovery.wmnet",prog="atsbackend.mtail"}
0.33
trafficserver_backend_total_plugin_time_count{backend="appservers-rw.discovery.wmnet",prog="atsbackend.mtail"}
8.036859e+06
```
While ATS 9.x instances report >0ms more often (bucket measures time in
seconds not ms):
```
trafficserver_backend_total_plugin_time_sum{backend="appservers-rw.discovery.wmnet",prog="atsbackend.mtail"}
1486.0159999757298
trafficserver_backend_total_plugin_time_count{backend="appservers-rw.discovery.wmnet",prog="atsbackend.mtail"}
3.439146e+06
```
As expected, the described behavior hasn't changed after updating to 9.1.3
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