You can zero a metric while running ATS by running this command:
sudo /usr/local/bin/traffic_ctl metric zero 
proxy.process.http.completed_requests

Or you can shutdown ATS and remove the metrics file:
09:37:25 homer:~$ /usr/local/bin/traffic_ctl metric get 
proxy.process.http.completed_requests
proxy.process.http.completed_requests 1000000
09:39:25 homer:~$ sudo /usr/local/bin/trafficserver stop
Stopping traffic_manager:                                  [  OK  ]
Stopping traffic_server:                                   [  OK  ]
09:39:36 homer:~$ sudo rm /usr/local/var/trafficserver/records.snap
09:40:08 homer:~$ sudo /usr/local/bin/trafficserver start
Starting Apache Traffic Server:                            [  OK  ]
09:40:23 homer:~$ /usr/local/bin/traffic_ctl metric get 
proxy.process.http.completed_requests
proxy.process.http.completed_requests 0

-Bryan



> On Mar 18, 2019, at 10:34 PM, Jason Yang <[email protected]> wrote:
> 
> Hi Bryan, 
>     How can I reset the statistics? I have tried traffic_server -Cclear and 
> delete everything under var/log and var/trafficserver, but it seems the 
> statistics is not reset. Thank you! 
> 
> 
> Best, 
> Jason 
> 
> 
>> On Mar 11, 2019, at 12:07, Bryan Call <[email protected] 
>> <mailto:[email protected]>> wrote:
>> 
>> It depends on what you mean as a miss.  If you mean that it has to go to the 
>> origin no matter what (even revalidating the cache entry) then it should be 
>> 100 - fresh.
>> 
>> Also, if you hit "a" you can get the stats from since the server started and 
>> you can get the number of incoming requests and requests going go the origin.
>> 
>> -Bryan
>> 
>> 
>> 
>>> On Mar 7, 2019, at 4:04 PM, Jason Yang <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> Hi community, 
>>>      I see there is such tool traffic_top, but I am confusing which of the 
>>> number shows miss ratio? 
>>> By miss ratio I mean the number that 
>>> miss_ratio*request_traffic=traffic_to_origin. 
>>> 
>>> 
>>> Best, 
>>> Jason 
>>> 
>>> 
>> 
> 

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