Add Metrics For The Merged Segment Warmer Flow

[kh3ra]

Description

This PR introduces comprehensive metrics for monitoring merged segment warming operations, building upon the work from PR#18683, Issue#17528. These metrics provide insights into warming operations, data transfer, and performance characteristics.

Metrics Added

Cumulative Metrics

Added the following metrics under merges.warmer:

• total_invocations_count: Tracks total number of warm operations
• total_time_millis: Total time spent in warming operations
• total_failure_count: Number of failed warming attempts
• total_bytes_sent: Total data volume uploaded
• total_bytes_received: Total data volume downloaded
• total_send_time: Cumulative time spent in uploads
• total_receive_time: Cumulative time spent in downloads

Point-in-Time Metrics

• ongoing_count: Current number of active warming operations

API Changes

/_nodes/stats/indices/merge

{
  "_nodes": {
    "total": 4,
    "successful": 4,
    "failed": 0
  },
  "cluster_name": "opensearch-cluster",
  "nodes": {
    "n3zTQMDcQYOca2jeSt9ALA": {
      "timestamp": 1757059591666,
      "name": "opensearch-node2",
      "transport_address": "172.18.0.3:9300",
      "host": "172.18.0.3",
      "ip": "172.18.0.3:9300",
      "roles": [
        "data",
        "ingest",
        "remote_cluster_client"
      ],
      "attributes": {
        "remote_store.repository.state.settings.location": "/usr/share/opensearch/remote/state",
        "remote_store.repository.translog.type": "fs",
        "remote_store.repository.state.type": "fs",
        "remote_store.state.repository": "state",
        "remote_store.repository.segment.type": "fs",
        "shard_indexing_pressure_enabled": "true",
        "remote_store.repository.segment.settings.location": "/usr/share/opensearch/remote/segment",
        "remote_store.segment.repository": "segment",
        "remote_store.translog.repository": "translog",
        "remote_store.repository.translog.settings.location": "/usr/share/opensearch/remote/translog"
      },
      "indices": {
        "merges": {
          "current": 0,
          "current_docs": 0,
          "current_size_in_bytes": 0,
          "total": 1,
          "total_time_in_millis": 325,
          "total_docs": 37,
          "total_size_in_bytes": 316031,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 20971520,
          "unreferenced_file_cleanups_performed": 0,
          "warmer": {
            "total_invocations_count": 1,
            "total_time_millis": 184,
            "total_failure_count": 0,
            "total_bytes_sent": 158956,
            "total_bytes_received": 0,
            "total_send_time_millis": 74,
            "total_receive_time_millis": 0,
            "ongoing_count": 0
          }
        }
      }
    },
    "2-by2PpBRRq7Z39w8Lvstw": {
      "timestamp": 1757059591669,
      "name": "opensearch-node3",
      "transport_address": "172.18.0.5:9300",
      "host": "172.18.0.5",
      "ip": "172.18.0.5:9300",
      "roles": [
        "data",
        "ingest",
        "remote_cluster_client"
      ],
      "attributes": {
        "remote_store.repository.state.settings.location": "/usr/share/opensearch/remote/state",
        "remote_store.repository.translog.type": "fs",
        "remote_store.repository.state.type": "fs",
        "remote_store.state.repository": "state",
        "remote_store.repository.segment.type": "fs",
        "shard_indexing_pressure_enabled": "true",
        "remote_store.repository.segment.settings.location": "/usr/share/opensearch/remote/segment",
        "remote_store.segment.repository": "segment",
        "remote_store.translog.repository": "translog",
        "remote_store.repository.translog.settings.location": "/usr/share/opensearch/remote/translog"
      },
      "indices": {
        "merges": {
          "current": 0,
          "current_docs": 0,
          "current_size_in_bytes": 0,
          "total": 0,
          "total_time_in_millis": 0,
          "total_docs": 0,
          "total_size_in_bytes": 0,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 0,
          "unreferenced_file_cleanups_performed": 0,
          "warmer": {
            "total_invocations_count": 0,
            "total_time_millis": 0,
            "total_failure_count": 0,
            "total_bytes_sent": 0,
            "total_bytes_received": 158956,
            "total_send_time_millis": 0,
            "total_receive_time_millis": 88,
            "ongoing_count": 0
          }
        }
      }
    },
    "SvhMX0XxSJak03cuzK3XJA": {
      "timestamp": 1757059591667,
      "name": "opensearch-node1",
      "transport_address": "172.18.0.4:9300",
      "host": "172.18.0.4",
      "ip": "172.18.0.4:9300",
      "roles": [
        "data",
        "ingest",
        "remote_cluster_client"
      ],
      "attributes": {
        "remote_store.repository.state.settings.location": "/usr/share/opensearch/remote/state",
        "remote_store.repository.translog.type": "fs",
        "remote_store.repository.state.type": "fs",
        "remote_store.state.repository": "state",
        "remote_store.repository.segment.type": "fs",
        "shard_indexing_pressure_enabled": "true",
        "remote_store.repository.segment.settings.location": "/usr/share/opensearch/remote/segment",
        "remote_store.segment.repository": "segment",
        "remote_store.translog.repository": "translog",
        "remote_store.repository.translog.settings.location": "/usr/share/opensearch/remote/translog"
      },
      "indices": {
        "merges": {
          "current": 0,
          "current_docs": 0,
          "current_size_in_bytes": 0,
          "total": 0,
          "total_time_in_millis": 0,
          "total_docs": 0,
          "total_size_in_bytes": 0,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 0,
          "unreferenced_file_cleanups_performed": 0,
          "warmer": {
            "total_invocations_count": 0,
            "total_time_millis": 0,
            "total_failure_count": 0,
            "total_bytes_sent": 0,
            "total_bytes_received": 0,
            "total_send_time_millis": 0,
            "total_receive_time_millis": 0,
            "ongoing_count": 0
          }
        }
      }
    }
}

/_stats/merge

{
  "_shards": {
    "total": 2,
    "successful": 2,
    "failed": 0
  },
  "_all": {
    "primaries": {
      "merges": {
        "current": 0,
        "current_docs": 0,
        "current_size_in_bytes": 0,
        "total": 19,
        "total_time_in_millis": 5299,
        "total_docs": 2524,
        "total_size_in_bytes": 12307726,
        "total_stopped_time_in_millis": 0,
        "total_throttled_time_in_millis": 0,
        "total_auto_throttle_in_bytes": 20971520,
        "unreferenced_file_cleanups_performed": 0,
        "warmer": {
          "total_invocations_count": 19,
          "total_time_millis": 3589,
          "total_failure_count": 0,
          "total_bytes_sent": 9071479,
          "total_bytes_received": 0,
          "total_send_time_millis": 1271,
          "total_receive_time_millis": 0,
          "ongoing_count": 0
        }
      }
    },
    "total": {
      "merges": {
        "current": 0,
        "current_docs": 0,
        "current_size_in_bytes": 0,
        "total": 19,
        "total_time_in_millis": 5299,
        "total_docs": 2524,
        "total_size_in_bytes": 12307726,
        "total_stopped_time_in_millis": 0,
        "total_throttled_time_in_millis": 0,
        "total_auto_throttle_in_bytes": 20971520,
        "unreferenced_file_cleanups_performed": 0,
        "warmer": {
          "total_invocations_count": 19,
          "total_time_millis": 3589,
          "total_failure_count": 0,
          "total_bytes_sent": 9071479,
          "total_bytes_received": 17725826,
          "total_send_time_millis": 1271,
          "total_receive_time_millis": 4018,
          "ongoing_count": 0
        }
      }
    }
  },
  "indices": {
    "test-index": {
      "uuid": "VxNpGxAESxWv4d6bzUm86w",
      "primaries": {
        "merges": {
          "current": 0,
          "current_docs": 0,
          "current_size_in_bytes": 0,
          "total": 19,
          "total_time_in_millis": 5299,
          "total_docs": 2524,
          "total_size_in_bytes": 12307726,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 20971520,
          "unreferenced_file_cleanups_performed": 0,
          "warmer": {
            "total_invocations_count": 19,
            "total_time_millis": 3589,
            "total_failure_count": 0,
            "total_bytes_sent": 9071479,
            "total_bytes_received": 0,
            "total_send_time_millis": 1271,
            "total_receive_time_millis": 0,
            "ongoing_count": 0
          }
        }
      },
      "total": {
        "merges": {
          "current": 0,
          "current_docs": 0,
          "current_size_in_bytes": 0,
          "total": 19,
          "total_time_in_millis": 5299,
          "total_docs": 2524,
          "total_size_in_bytes": 12307726,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 20971520,
          "unreferenced_file_cleanups_performed": 0,
          "warmer": {
            "total_invocations_count": 19,
            "total_time_millis": 3589,
            "total_failure_count": 0,
            "total_bytes_sent": 9071479,
            "total_bytes_received": 17725826,
            "total_send_time_millis": 1271,
            "total_receive_time_millis": 4018,
            "ongoing_count": 0
          }
        }
      }
    }
  }
}

/_stats/merge?pretty&level=shards

{
  "_shards": {
    "total": 2,
    "successful": 2,
    "failed": 0
  },
  "_all": {
    "primaries": {
      "merges": {
        "current": 0,
        "current_docs": 0,
        "current_size_in_bytes": 0,
        "total": 23,
        "total_time_in_millis": 6323,
        "total_docs": 3428,
        "total_size_in_bytes": 16071365,
        "total_stopped_time_in_millis": 0,
        "total_throttled_time_in_millis": 0,
        "total_auto_throttle_in_bytes": 20971520,
        "unreferenced_file_cleanups_performed": 0,
        "warmer": {
          "total_invocations_count": 23,
          "total_time_millis": 4217,
          "total_failure_count": 0,
          "total_bytes_sent": 12107729,
          "total_bytes_received": 0,
          "total_send_time_millis": 1459,
          "total_receive_time_millis": 0,
          "ongoing_count": 0
        }
      }
    },
    "total": {
      "merges": {
        "current": 0,
        "current_docs": 0,
        "current_size_in_bytes": 0,
        "total": 23,
        "total_time_in_millis": 6323,
        "total_docs": 3428,
        "total_size_in_bytes": 16071365,
        "total_stopped_time_in_millis": 0,
        "total_throttled_time_in_millis": 0,
        "total_auto_throttle_in_bytes": 20971520,
        "unreferenced_file_cleanups_performed": 0,
        "warmer": {
          "total_invocations_count": 23,
          "total_time_millis": 4217,
          "total_failure_count": 0,
          "total_bytes_sent": 12107729,
          "total_bytes_received": 29833555,
          "total_send_time_millis": 1459,
          "total_receive_time_millis": 6444,
          "ongoing_count": 0
        }
      }
    }
  },
  "indices": {
    "test-index": {
      "uuid": "VxNpGxAESxWv4d6bzUm86w",
      "primaries": {
        "merges": {
          "current": 0,
          "current_docs": 0,
          "current_size_in_bytes": 0,
          "total": 23,
          "total_time_in_millis": 6323,
          "total_docs": 3428,
          "total_size_in_bytes": 16071365,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 20971520,
          "unreferenced_file_cleanups_performed": 0,
          "warmer": {
            "total_invocations_count": 23,
            "total_time_millis": 4217,
            "total_failure_count": 0,
            "total_bytes_sent": 12107729,
            "total_bytes_received": 0,
            "total_send_time_millis": 1459,
            "total_receive_time_millis": 0,
            "ongoing_count": 0
          }
        }
      },
      "total": {
        "merges": {
          "current": 0,
          "current_docs": 0,
          "current_size_in_bytes": 0,
          "total": 23,
          "total_time_in_millis": 6323,
          "total_docs": 3428,
          "total_size_in_bytes": 16071365,
          "total_stopped_time_in_millis": 0,
          "total_throttled_time_in_millis": 0,
          "total_auto_throttle_in_bytes": 20971520,
          "unreferenced_file_cleanups_performed": 0,
          "warmer": {
            "total_invocations_count": 23,
            "total_time_millis": 4217,
            "total_failure_count": 0,
            "total_bytes_sent": 12107729,
            "total_bytes_received": 29833555,
            "total_send_time_millis": 1459,
            "total_receive_time_millis": 6444,
            "ongoing_count": 0
          }
        }
      },
      "shards": {
        "0": [
          {
            "routing": {
              "state": "STARTED",
              "primary": true,
              "node": "n3zTQMDcQYOca2jeSt9ALA",
              "relocating_node": null
            },
            "merges": {
              "current": 0,
              "current_docs": 0,
              "current_size_in_bytes": 0,
              "total": 23,
              "total_time_in_millis": 6323,
              "total_docs": 3428,
              "total_size_in_bytes": 16071365,
              "total_stopped_time_in_millis": 0,
              "total_throttled_time_in_millis": 0,
              "total_auto_throttle_in_bytes": 20971520,
              "unreferenced_file_cleanups_performed": 0,
              "warmer": {
                "total_invocations_count": 23,
                "total_time_millis": 4217,
                "total_failure_count": 0,
                "total_bytes_sent": 12107729,
                "total_bytes_received": 0,
                "total_send_time_millis": 1459,
                "total_receive_time_millis": 0,
                "ongoing_count": 0
              }
            },
            "commit": {
              "id": "8rgsCwSDGwTMVTE7UXlz2w==",
              "generation": 3,
              "user_data": {
                "min_retained_seq_no": "0",
                "translog_uuid": "mM3XtVkzRBmZMbK7YktNpg",
                "local_checkpoint": "-1",
                "history_uuid": "hNsSVAB0RLWewv9HSWiI9A",
                "max_seq_no": "-1",
                "max_unsafe_auto_id_timestamp": "-1"
              },
              "num_docs": 0
            },
            "seq_no": {
              "max_seq_no": 799,
              "local_checkpoint": 799,
              "global_checkpoint": 799
            },
            "retention_leases": {
              "primary_term": 1,
              "version": 6,
              "leases": [
                {
                  "id": "peer_recovery/n3zTQMDcQYOca2jeSt9ALA",
                  "retaining_seq_no": 797,
                  "timestamp": 1757059730737,
                  "source": "peer recovery"
                }
              ]
            },
            "shard_path": {
              "state_path": "/usr/share/opensearch/data/nodes/0",
              "data_path": "/usr/share/opensearch/data/nodes/0",
              "is_custom_data_path": false
            }
          },
          {
            "routing": {
              "state": "STARTED",
              "primary": false,
              "node": "2-by2PpBRRq7Z39w8Lvstw",
              "relocating_node": null
            },
            "merges": {
              "current": 0,
              "current_docs": 0,
              "current_size_in_bytes": 0,
              "total": 0,
              "total_time_in_millis": 0,
              "total_docs": 0,
              "total_size_in_bytes": 0,
              "total_stopped_time_in_millis": 0,
              "total_throttled_time_in_millis": 0,
              "total_auto_throttle_in_bytes": 0,
              "unreferenced_file_cleanups_performed": 0,
              "warmer": {
                "total_invocations_count": 0,
                "total_time_millis": 0,
                "total_failure_count": 0,
                "total_bytes_sent": 0,
                "total_bytes_received": 29833555,
                "total_send_time_millis": 0,
                "total_receive_time_millis": 6444,
                "ongoing_count": 0
              }
            },
            "commit": {
              "id": "Ouxkq5fRF2ZOcdcXMMF4DA==",
              "generation": 6,
              "user_data": {
                "min_retained_seq_no": "0",
                "translog_uuid": "mM3XtVkzRBmZMbK7YktNpg",
                "local_checkpoint": "-1",
                "history_uuid": "hNsSVAB0RLWewv9HSWiI9A",
                "max_seq_no": "-1",
                "max_unsafe_auto_id_timestamp": "-1"
              },
              "num_docs": 0
            },
            "seq_no": {
              "max_seq_no": 799,
              "local_checkpoint": -1,
              "global_checkpoint": -1
            },
            "retention_leases": {
              "primary_term": 1,
              "version": 0,
              "leases": []
            },
            "shard_path": {
              "state_path": "/usr/share/opensearch/data/nodes/0",
              "data_path": "/usr/share/opensearch/data/nodes/0",
              "is_custom_data_path": false
            }
          }
        ]
      }
    }
  }
}

/_cat/shards?v&h=index,shard,prirep,merges.*&format=json

[
  {
    "index": "test-index",
    "shard": "0",
    "prirep": "p",
    "merges.current": "0",
    "merges.current_docs": "0",
    "merges.current_size": "0b",
    "merges.total": "23",
    "merges.total_docs": "3428",
    "merges.total_size": "15.3mb",
    "merges.total_time": "6.3s",
    "merges.warmer.total_invocations": "23",
    "merges.warmer.total_time": "4.2s",
    "merges.warmer.ongoing_count": "0",
    "merges.warmer.total_bytes_received": "0b",
    "merges.warmer.total_bytes_sent": "11.5mb",
    "merges.warmer.total_receive_time": "0s",
    "merges.warmer.total_failure_count": "0",
    "merges.warmer.total_send_time": "1.4s"
  },
  {
    "index": "test-index",
    "shard": "0",
    "prirep": "r",
    "merges.current": "0",
    "merges.current_docs": "0",
    "merges.current_size": "0b",
    "merges.total": "0",
    "merges.total_docs": "0",
    "merges.total_size": "0b",
    "merges.total_time": "0s",
    "merges.warmer.total_invocations": "0",
    "merges.warmer.total_time": "0s",
    "merges.warmer.ongoing_count": "0",
    "merges.warmer.total_bytes_received": "63mb",
    "merges.warmer.total_bytes_sent": "0b",
    "merges.warmer.total_receive_time": "13.7s",
    "merges.warmer.total_failure_count": "0",
    "merges.warmer.total_send_time": "0s"
  }
]

/_cat/nodes?v&h=id,merges.*&format=json

[
  {
    "id": "n3zT",
    "merges.current": "0",
    "merges.current_docs": "0",
    "merges.current_size": "0b",
    "merges.total": "23",
    "merges.total_docs": "3428",
    "merges.total_size": "15.3mb",
    "merges.total_time": "6.3s",
    "merges.warmer.total_invocations": "23",
    "merges.warmer.total_time": "4.2s",
    "merges.warmer.ongoing_count": "0",
    "merges.warmer.total_bytes_received": "0b",
    "merges.warmer.total_bytes_sent": "11.5mb",
    "merges.warmer.total_receive_time": "0s",
    "merges.warmer.total_failure_count": "0",
    "merges.warmer.total_send_time": "1.4s"
  },
  {
    "id": "2-by",
    "merges.current": "0",
    "merges.current_docs": "0",
    "merges.current_size": "0b",
    "merges.total": "0",
    "merges.total_docs": "0",
    "merges.total_size": "0b",
    "merges.total_time": "0s",
    "merges.warmer.total_invocations": "0",
    "merges.warmer.total_time": "0s",
    "merges.warmer.ongoing_count": "0",
    "merges.warmer.total_bytes_received": "86.1mb",
    "merges.warmer.total_bytes_sent": "0b",
    "merges.warmer.total_receive_time": "18.5s",
    "merges.warmer.total_failure_count": "0",
    "merges.warmer.total_send_time": "0s"
  },
  {
    "id": "SvhM",
    "merges.current": "0",
    "merges.current_docs": "0",
    "merges.current_size": "0b",
    "merges.total": "0",
    "merges.total_docs": "0",
    "merges.total_size": "0b",
    "merges.total_time": "0s",
    "merges.warmer.total_invocations": "0",
    "merges.warmer.total_time": "0s",
    "merges.warmer.ongoing_count": "0",
    "merges.warmer.total_bytes_received": "0b",
    "merges.warmer.total_bytes_sent": "0b",
    "merges.warmer.total_receive_time": "0s",
    "merges.warmer.total_failure_count": "0",
    "merges.warmer.total_send_time": "0s"
  },
  {
    "id": "SBeY",
    "merges.current": "0",
    "merges.current_docs": "0",
    "merges.current_size": "0b",
    "merges.total": "0",
    "merges.total_docs": "0",
    "merges.total_size": "0b",
    "merges.total_time": "0s",
    "merges.warmer.total_invocations": "0",
    "merges.warmer.total_time": "0s",
    "merges.warmer.ongoing_count": "0",
    "merges.warmer.total_bytes_received": "0b",
    "merges.warmer.total_bytes_sent": "0b",
    "merges.warmer.total_receive_time": "0s",
    "merges.warmer.total_failure_count": "0",
    "merges.warmer.total_send_time": "0s"
  }
]

/_cat/indices?v&h=id,merges.warmer.*&format=json

[
  {
    "id": "brrP7gIbR2ivDZ7PGKIBWA",
    "merges.warmer.total_invocations": "0",
    "merges.warmer.total_time": "0s",
    "merges.warmer.ongoing_count": "0",
    "merges.warmer.total_bytes_received": "0b",
    "merges.warmer.total_bytes_sent": "0b",
    "merges.warmer.total_receive_time": "0s",
    "merges.warmer.total_failure_count": "0",
    "merges.warmer.total_send_time": "0s"
  }
]

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 3dfd64f: FAILURE

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❌ Gradle check result for 166ec29: FAILURE

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❌ Gradle check result for 12721aa: FAILURE

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❌ Gradle check result for b5bc126: FAILURE

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❌ Gradle check result for 66fa8f1: null

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[github-actions]

❌ Gradle check result for 2a071c8: FAILURE

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❌ Gradle check result for a142adb: FAILURE

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[github-actions]

❌ Gradle check result for a68d57b: FAILURE

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❌ Gradle check result for d6be469: FAILURE

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❌ Gradle check result for a6c9a97: FAILURE

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❌ Gradle check result for ba2cec5: FAILURE

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[github-actions]

✅ Gradle check result for 1739f47: SUCCESS

[codecov]

Codecov Report

❌ Patch coverage is 80.07117% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.12%. Comparing base (252cff8) to head (1739f47).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../opensearch/rest/action/cat/RestIndicesAction.java	52.63%	0 Missing and 18 partials ⚠️
...rg/opensearch/rest/action/cat/RestNodesAction.java	47.05%	0 Missing and 9 partials ⚠️
...g/opensearch/rest/action/cat/RestShardsAction.java	75.00%	0 Missing and 8 partials ⚠️
...in/java/org/opensearch/index/merge/MergeStats.java	75.00%	2 Missing and 3 partials ⚠️
...g/opensearch/index/engine/MergedSegmentWarmer.java	77.77%	1 Missing and 3 partials ⚠️
.../opensearch/index/engine/NRTReplicationEngine.java	0.00%	3 Missing ⚠️
...es/replication/MergedSegmentReplicationTarget.java	40.00%	3 Missing ⚠️
...on/checkpoint/AbstractPublishCheckpointAction.java	57.14%	3 Missing ⚠️
...ckpoint/RemoteStorePublishMergedSegmentAction.java	80.00%	2 Missing ⚠️
...ensearch/index/merge/MergedSegmentWarmerStats.java	98.36%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #18929      +/-   ##
============================================
+ Coverage     73.11%   73.12%   +0.01%     
- Complexity    70661    70764     +103     
============================================
  Files          5724     5726       +2     
  Lines        323498   323750     +252     
  Branches      46852    46882      +30     
============================================
+ Hits         236518   236748     +230     
- Misses        67846    67941      +95     
+ Partials      19134    19061      -73     

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