[jira] [Created] (TS-4193) Enabling proxy.config.disable_configuration_modification can "lose" metrics via e.g. stats_over_http

[Leif Hedstrom (JIRA)]

Leif Hedstrom created TS-4193:
---------------------------------

             Summary: Enabling proxy.config.disable_configuration_modification 
can "lose" metrics via e.g. stats_over_http
                 Key: TS-4193
                 URL: https://issues.apache.org/jira/browse/TS-4193
             Project: Traffic Server
          Issue Type: Bug
          Components: Manager, Metrics, Plugins
            Reporter: Leif Hedstrom


With normal configs, using stats_over_http, I get e.g.

{code}
loki (10:50) 339/0 $ curl -s  http://loki.ogre.com/_bazinga | grep 
proxy.node.http.user_agent_total
"proxy.node.http.user_agent_total_request_bytes": "789",
"proxy.node.http.user_agent_total_response_bytes": "612070",
{code}

However, if I disable config write updates 
(proxy.config.disable_configuration_modification=1), these metrics are no 
longer producing values via stats_over_http:

{code}
loki (10:52) 341/0 $ curl -s  http://loki.ogre.com/_bazinga | grep 
proxy.node.http.user_agent_total
"proxy.node.http.user_agent_total_request_bytes": "0",
"proxy.node.http.user_agent_total_response_bytes": "0",
{code}

What's surprising is the according to traffic_ctl, the metrics are fine even 
with the new config enabled:

{code}
loki (10:52) 341/0 $ /opt/ats/bin/traffic_ctl  metric match 
proxy.node.http.user_agent_total
proxy.node.http.user_agent_total_request_bytes 1948
proxy.node.http.user_agent_total_response_bytes 1699917
{code}

Maybe these changes interfere with how the stats_over_http plugin uses the lib 
records iterator?



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