anchor.diff:  |Attributes |Type |Description
   
   |[[log-miner-metrics-currentscn]]<<log-miner-metrics-currentscn, `+CurrentScn+`>>
  -|`long`
  +|`string`
   |The most recent SCN that has been processed.
   
   |[[log-miner-metrics-currentredologfilename]]<<log-miner-metrics-currentredologfilename, `+CurrentRedoLogFileName+`>>
  
positive.code:             "name": "server1",
              "ts_ms": 1520085153000,
              "txId": "6.28.807",
              "scn": 2122184,
              "commit_scn": 2122184,
              "snapshot": false
          },
          "op": "d",
  
negative.code:             "name": "server1",
              "ts_ms": 1520085811000,
              "txId": "6.9.809",
              "scn": "2125544",
              "commit_scn": "2125544",
              "snapshot": false
          },
          "op": "u",
  