[I] cache_promote.so adding --stats-enable-with-id requires restart [trafficserver]

["mattyw (via GitHub)" <gi...@apache.org>]

mattyw opened a new issue, #12368:
URL: https://github.com/apache/trafficserver/issues/12368

   The `--stats-enable-with-id` argument on cache_promote requires a full ATS restart to function correctly. This isn't documented, and is painful if you want to only enable cache promote statistics for a short time to do some analysis.
   
   To reproduce:
   
   Create a simple remap rule:
   
   ```
   map http://localhost:8080/batch1 http://localhost:8081/batch1 \
       @plugin=cache_promote.so @pparam=--policy=lru @pparam=--hits=2
   ```
   
   Start ATS, then edit the remap rule to add `--stats-enable-with-id` and `traffic_ctl config reload`
   
   
   ```
   map http://localhost:8080/batch1 http://localhost:8081/batch1 \
       @plugin=cache_promote.so @pparam=--policy=lru @pparam=--hits=2 @pparam=--stats-enable-with-id=remap1
   ```
   
   Then send some requests and you'll observe the stats remain at 0
   
   ```
   $ curl -v http://localhost:8080/batch1?max-age=5 
   $ traffic_ctl metric match cache_promote
   ...
   plugin.cache_promote.remap1.total_requests 0
   ...
   ```
   
   Restart ATS and send another request and you'll see the metric be correctly incremented
   
   ```
   $ curl -v http://localhost:8080/batch1?max-age=5 
   $ traffic_ctl metric match cache_promote
   ...
   plugin.cache_promote.remap1.total_requests 1
   ...
   ```


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Re: [I] cache_promote.so adding --stats-enable-with-id requires restart [trafficserver]

["zwoop (via GitHub)" <gi...@apache.org>]

zwoop closed issue #12368: cache_promote.so adding --stats-enable-with-id requires restart
URL: https://github.com/apache/trafficserver/issues/12368


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