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metrics.md

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Xline metrics

Many metrics are similar to those in etcd.

CURP Server

  1. leader_changes: Counter The number of leader changes seen.

  2. learner_promote_failed: Counter The total number of failed learner promotions (likely learner not ready) while this member is leader.

  3. learner_promote_succeed: Counter The total number of successful learner promotions while this member is leader.

  4. heartbeat_send_failures: Counter The total number of leader heartbeat send failures (likely overloaded from slow disk).

  5. apply_snapshot_in_progress: UpDownCounter not equals to 0 if the server is applying the incoming snapshot. 0 if none.

  6. proposals_committed: ObservableGauge The total number of consensus proposals committed.

  7. proposals_failed: Counter The total number of failed proposals seen.

  8. proposals_applied: ObservableGauge The total number of consensus proposals applied.

  9. proposals_pending: ObservableGauge The current number of pending proposals to commit.

  10. snapshot_install_total_duration_seconds: Histogram The total latency distributions of save called by install_snapshot.

  11. client_id_revokes: Counter The total number of client id revokes times.

  12. has_leader: ObservableGauge Whether or not a leader exists. 1 is existence, 0 is not.

  13. is_leader: ObservableGauge Whether or not this member is a leader. 1 if is, 0 otherwise.

  14. is_learner: ObservableGauge Whether or not this member is a learner. 1 if is, 0 otherwise.

  15. server_id: ObservableGauge Server or member ID in hexadecimal format. 1 for 'server_id' label with the current ID.

  16. sp_cnt: ObservableGauge The speculative pool size of this server.

  17. online_clients: ObservableGauge The online client IDs count of this server if it is the leader.

CURP Client

  1. client_retry_count: Counter The total number of retries when the client propose to the cluster.

  2. client_fast_path_count: Counter The total number of fast path when the client propose to the cluster.

  3. client_slow_path_count: Counter The total number of slow path when the client propose to the cluster.

  4. client_fast_path_fallback_slow_path_count: Counter The total number of fast path fallbacks into slow path when the client propose to the cluster.

Xline

  1. slow_read_indexes: Counter The total number of pending read indexes not in sync with leader's or timed out read index requests.

  2. read_indexes_failed: Counter The total number of failed read indexes seen.

  3. lease_expired: Counter The total number of expired leases.

  4. fd_used: ObservableGauge The number of used file descriptors.

  5. fd_limit: ObservableGauge The file descriptor limit.

  6. current_version: ObservableGauge Which version is running. 1 for 'server_version' label with the current version.

  7. current_rust_version: ObservableGauge Which Rust version the server is running with. 1 for 'server_rust_version' label with the current version.

Engine

  1. engine_apply_snapshot_duration_seconds: Histogram The backend engine apply snapshot duration in seconds.

  2. engine_write_batch_duration_seconds: Histogram The backend engine write batch engine, batch_size refer to the size and sync if sync option is on.

Network

  1. peer_sent_bytes: Counter The total number of bytes sent to peers.

  2. peer_sent_failures: Counter The total number of send failures to peers.

  3. peer_round_trip_time_seconds: Histogram The round-trip-time histogram between peers.