empiredan opened a new issue, #1343:
URL: https://github.com/apache/incubator-pegasus/issues/1343

   Some classes that have few of replica-level metrics are collected into one 
issue to be migrated.
   
   <br/>
   
   Following metrics are the members of `pegasus_event_listener` 
([pegasus_event_listener.cpp](https://github.com/apache/incubator-pegasus/blob/master/src/server/pegasus_event_listener.cpp)),
 which is created at the construction of `pegasus_server_impl`:
   | Variables | Types/Computations |
   | :--------: | :-------------------: |
   | _pfc_recent_rdb_compaction_input_bytes | increase(Counter) |
   | _pfc_recent_rdb_compaction_output_bytes | increase(Counter) |
   
   <br/>
   
   Following metrics are the members of `pegasus_mutation_duplicator` 
([pegasus_mutation_duplicator.cpp](https://github.com/apache/incubator-pegasus/blob/master/src/server/pegasus_mutation_duplicator.cpp)),
 which is created in the call chain `ship_mutation::ship_mutation()` ← 
`replica_duplicator::start_dup_log()` ← 
`replica_duplicator_manager::sync_duplication() ← replica::replica()` (actually 
the metrics in `pegasus_mutation_duplicator` of a replica share one metric 
instance):
   | Variables | Types/Computations |
   | :--------: | :-------------------: |
   | _shipped_ops | rate(Counter) |
   | _failed_shipping_ops | rate(Counter) |


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