# Metrics

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- [RabbitMQ](#rabbitmq)
	- [Global](#global)
	- [Overview](#overview)
	- [Connections](#connections)
	- [Channels](#channels)
	- [Queues](#queues)
	- [Erlang via RabbitMQ](#erlang-via-rabbitmq)
	- [Disk IO](#disk-io)
	- [Raft](#raft)
- [Telemetry](#telemetry)
- [Erlang](#erlang)
	- [Mnesia](#mnesia)
	- [VM](#vm)

<!-- /TOC -->

## RabbitMQ

### Global

| Metric                     | Description                                                           |
| ---                        | ---                                                                   |
| rabbitmq_consumer_prefetch | Limit of unacknowledged messages for each consumer                    |
| rabbitmq_channel_prefetch  | Total limit of unacknowledged messages for all consumers on a channel |

### Overview

| Metric                                    | Description                                      |
| ---                                       | ---                                              |
| rabbitmq_connections_opened_total         | Total number of connections opened               |
| rabbitmq_connections_closed_total         | Total number of connections closed or terminated |
| rabbitmq_channels_opened_total            | Total number of channels opened                  |
| rabbitmq_channels_closed_total            | Total number of channels closed                  |
| rabbitmq_queues_declared_total            | Total number of queues declared                  |
| rabbitmq_queues_created_total             | Total number of queues created                   |
| rabbitmq_queues_deleted_total             | Total number of queues deleted                   |
| rabbitmq_process_open_fds                 | Open file descriptors                            |
| rabbitmq_process_open_tcp_sockets         | Open TCP sockets                                 |
| rabbitmq_process_resident_memory_bytes    | Memory used in bytes                             |
| rabbitmq_disk_space_available_bytes       | Disk space available in bytes                    |
| rabbitmq_process_max_fds                  | Open file descriptors limit                      |
| rabbitmq_process_max_tcp_sockets          | Open TCP sockets limit                           |
| rabbitmq_resident_memory_limit_bytes      | Memory high watermark in bytes                   |
| rabbitmq_disk_space_available_limit_bytes | Free disk space low watermark in bytes           |
| rabbitmq_connections                      | Connections currently open                       |
| rabbitmq_channels                         | Channels currently open                          |
| rabbitmq_consumers                        | Consumers currently connected                    |
| rabbitmq_queues                           | Queues available                                 |
| rabbitmq_build_info                       | RabbitMQ & Erlang/OTP version info               |
| rabbitmq_identity_info                    | RabbitMQ node & cluster identity info            |

### Connections

| Metric                                       | Description                                          |
| ---                                          | ---                                                  |
| rabbitmq_connection_incoming_bytes_total     | Total number of bytes received on a connection       |
| rabbitmq_connection_outgoing_bytes_total     | Total number of bytes sent on a connection           |
| rabbitmq_connection_process_reductions_total | Total number of connection process reductions        |
| rabbitmq_connection_incoming_packets_total   | Total number of packets received on a connection     |
| rabbitmq_connection_outgoing_packets_total   | Total number of packets sent on a connection         |
| rabbitmq_connection_pending_packets          | Number of packets waiting to be sent on a connection |
| rabbitmq_connection_channels                 | Channels on a connection                             |

### Channels

| Metric                                              | Description                                                                                                  |
| ---                                                 | ---                                                                                                          |
| rabbitmq_channel_consumers                          | Consumers on a channel                                                                                       |
| rabbitmq_channel_messages_unacked                   | Delivered but not yet acknowledged messages                                                                  |
| rabbitmq_channel_messages_unconfirmed               | Published but not yet confirmed messages                                                                     |
| rabbitmq_channel_messages_uncommitted               | Messages received in a transaction but not yet committed                                                     |
| rabbitmq_channel_acks_uncommitted                   | Message acknowledgements in a transaction not yet committed                                                  |
| rabbitmq_channel_messages_published_total           | Total number of messages published into an exchange on a channel                                             |
| rabbitmq_channel_messages_confirmed_total           | Total number of messages published into an exchange and confirmed on the channel                             |
| rabbitmq_channel_messages_unroutable_returned_total | Total number of messages published as mandatory into an exchange and returned to the publisher as unroutable |
| rabbitmq_channel_messages_unroutable_dropped_total  | Total number of messages published as non-mandatory into an exchange and dropped as unroutable               |
| rabbitmq_channel_process_reductions_total           | Total number of channel process reductions                                                                   |
| rabbitmq_channel_get_ack_total                      | Total number of messages fetched with basic.get in manual acknowledgement mode                               |
| rabbitmq_channel_get_total                          | Total number of messages fetched with basic.get in automatic acknowledgement mode                            |
| rabbitmq_channel_messages_delivered_ack_total       | Total number of messages delivered to consumers in manual acknowledgement mode                               |
| rabbitmq_channel_messages_delivered_total           | Total number of messages delivered to consumers in automatic acknowledgement mode                            |
| rabbitmq_channel_messages_redelivered_total         | Total number of messages redelivered to consumers                                                            |
| rabbitmq_channel_messages_acked_total               | Total number of messages acknowledged by consumers                                                           |
| rabbitmq_channel_get_empty_total                    | Total number of times basic.get operations fetched no message                                                |


### Queues

| Metric                                  | Description                                                  |
| ---                                     | ---                                                          |
| rabbitmq_queue_messages_published_total | Total number of messages published to queues                 |
| rabbitmq_queue_messages_ready           | Messages ready to be delivered to consumers                  |
| rabbitmq_queue_messages_unacked         | Messages delivered to consumers but not yet acknowledged     |
| rabbitmq_queue_messages                 | Sum of ready and unacknowledged messages - total queue depth |
| rabbitmq_queue_process_reductions_total | Total number of queue process reductions                     |
| rabbitmq_queue_consumers                         | Consumers on a queue                                         |
| rabbitmq_queue_consumer_utilisation              | Consumer utilisation                                         |
| rabbitmq_queue_process_memory_bytes              | Memory in bytes used by the Erlang queue process             |
| rabbitmq_queue_messages_ram                      | Ready and unacknowledged messages stored in memory           |
| rabbitmq_queue_messages_ram_bytes                | Size of ready and unacknowledged messages stored in memory   |
| rabbitmq_queue_messages_ready_ram                | Ready messages stored in memory                              |
| rabbitmq_queue_messages_unacked_ram              | Unacknowledged messages stored in memory                     |
| rabbitmq_queue_messages_persistent               | Persistent messages                                          |
| rabbitmq_queue_messages_persistent_bytes         | Size in bytes of persistent messages                         |
| rabbitmq_queue_messages_bytes                    | Size in bytes of ready and unacknowledged messages           |
| rabbitmq_queue_messages_ready_bytes              | Size in bytes of ready messages                              |
| rabbitmq_queue_messages_unacked_bytes            | Size in bytes of all unacknowledged messages                 |
| rabbitmq_queue_messages_paged_out                | Messages paged out to disk                                   |
| rabbitmq_queue_messages_paged_out_bytes          | Size in bytes of messages paged out to disk                  |
| rabbitmq_queue_disk_reads_total                  | Total number of times queue read messages from disk          |
| rabbitmq_queue_disk_writes_total                 | Total number of times queue wrote messages to disk           |



### Erlang via RabbitMQ

| Metric                                           | Description                                                     |
| ---                                              | ---                                                             |
| rabbitmq_erlang_processes_used                   | Erlang processes used                                           |
| rabbitmq_erlang_gc_runs_total                    | Total number of Erlang garbage collector runs                   |
| rabbitmq_erlang_gc_reclaimed_bytes_totalTotal    | number of bytes of memory reclaimed by Erlang garbage collector |
| rabbitmq_erlang_scheduler_context_switches_total | Total number of Erlang scheduler context switches               |
| rabbitmq_erlang_processes_limit                  | Erlang processes limit                                          |
| rabbitmq_erlang_scheduler_run_queue              | Erlang scheduler run queue                                      |
| rabbitmq_erlang_net_ticktime_seconds             | Inter-node heartbeat interval in seconds                        |
| rabbitmq_erlang_uptime_seconds                   | Node uptime                                                     |


### Disk IO

| Metric                                       | Description                                          |
| ---                                          | ---                                                  |
| rabbitmq_io_read_ops_total                   | Total number of I/O read operations                  |
| rabbitmq_io_read_bytes_total                 | Total number of I/O bytes read                       |
| rabbitmq_io_write_ops_total                  | Total number of I/O write operations                 |
| rabbitmq_io_write_bytes_total                | Total number of I/O bytes written                    |
| rabbitmq_io_sync_ops_total                   | Total number of I/O sync operations                  |
| rabbitmq_io_seek_ops_total                   | Total number of I/O seek operations                  |
| rabbitmq_io_open_attempt_ops_total           | Total number of file open attempts                   |
| rabbitmq_io_reopen_ops_total                 | Total number of times files have been reopened       |
| rabbitmq_schema_db_ram_tx_total              | Total number of Schema DB memory transactions        |
| rabbitmq_schema_db_disk_tx_total             | Total number of Schema DB disk transactions          |
| rabbitmq_msg_store_read_total                | Total number of Message Store read operations        |
| rabbitmq_msg_store_write_total               | Total number of Message Store write operations       |
| rabbitmq_queue_index_read_ops_total          | Total number of Queue Index read operations          |
| rabbitmq_queue_index_write_ops_total         | Total number of Queue Index write operations         |
| rabbitmq_queue_index_journal_write_ops_total | Total number of Queue Index Journal write operations |
| rabbitmq_io_read_time_seconds_total          | Total I/O read time                                  |
| rabbitmq_io_write_time_seconds_total         | Total I/O write time                                 |
| rabbitmq_io_sync_time_seconds_total          | Total I/O sync time                                  |
| rabbitmq_io_seek_time_seconds_total          | Total I/O seek time                                  |
| rabbitmq_io_open_attempt_time_seconds_total  | Total file open attempts time                        |

### Raft

| Metric                                     | Description                             |
| ---                                        | ---                                     |
| rabbitmq_raft_term_total                   | Current Raft term number                |
| rabbitmq_raft_log_snapshot_index           | Raft log snapshot index                 |
| rabbitmq_raft_log_last_applied_index       | Raft log last applied index             |
| rabbitmq_raft_log_commit_index             | Raft log commit index                   |
| rabbitmq_raft_log_last_written_index       | Raft log last written index             |
| rabbitmq_raft_entry_commit_latency_seconds | Time taken for an entry to be committed |

## Telemetry

| Metric                              | Description              |
| ---                                 | ---                      |
| telemetry_scrape_encoded_size_bytes | Scrape size, encoded     |
| telemetry_scrape_size_bytes         | Scrape size, not encoded |
| telemetry_scrape_duration_seconds   | Scrape duration          |

## Erlang

### Mnesia

| Metric                                 | Description                                  |
| ---                                    | ---                                          |
| erlang_mnesia_held_locks               | Number of held locks                         |
| erlang_mnesia_lock_queue               | Number of transactions waiting for a lock    |
| erlang_mnesia_transaction_participants | Number of participant transactions           |
| erlang_mnesia_transaction_coordinators | Number of coordinator transactions           |
| erlang_mnesia_failed_transactions      | Number of failed (i.e. aborted) transactions |
| erlang_mnesia_committed_transactions   | Number of committed transactions             |
| erlang_mnesia_logged_transactions      | Number of transactions logged                |
| erlang_mnesia_restarted_transactions   | Total number of transaction restarts         |


### VM

| Metric                                                  | Description                                                                                                                                                                                                      |
| ---                                                     | ---                                                                                                                                                                                                              |
| erlang_vm_dist_recv_bytes                               | Number of bytes received by the socket.                                                                                                                                                                          |
| erlang_vm_dist_recv_cnt                                 | Number of packets received by the socket.                                                                                                                                                                        |
| erlang_vm_dist_recv_max_bytes                           | Size of the largest packet, in bytes, received by the socket.                                                                                                                                                    |
| erlang_vm_dist_recv_avg_bytes                           | Average size of packets, in bytes, received by the socket.                                                                                                                                                       |
| erlang_vm_dist_recv_dvi_bytes                           | Average packet size deviation, in bytes, received by the socket.                                                                                                                                                 |
| erlang_vm_dist_send_bytes                               | Number of bytes sent from the socket.                                                                                                                                                                            |
| erlang_vm_dist_send_cnt                                 | Number of packets sent from the socket.                                                                                                                                                                          |
| erlang_vm_dist_send_max_bytes                           | Size of the largest packet, in bytes, sent from the socket.                                                                                                                                                      |
| erlang_vm_dist_send_avg_bytes                           | Average size of packets, in bytes, sent from the socket.                                                                                                                                                         |
| erlang_vm_dist_send_pend_bytes                          | Number of bytes waiting to be sent by the socket.                                                                                                                                                                |
| erlang_vm_dist_port_input_bytes                         | The total number of bytes read from the port.                                                                                                                                                                    |
| erlang_vm_dist_port_output_bytes                        | The total number of bytes written to the port.                                                                                                                                                                   |
| erlang_vm_dist_port_memory_bytes                        | The total number of bytes allocated for this port by the runtime system. The port itself can have allocated memory that is not included.                                                                         |
| erlang_vm_dist_port_queue_size_bytes                    | The total number of bytes queued by the port using the ERTS driver queue implementation.                                                                                                                         |
| erlang_vm_dist_proc_memory_bytes                        | The size in bytes of the process. This includes call stack, heap, and internal structures.                                                                                                                       |
| erlang_vm_dist_proc_heap_size_words                     | The size in words of the youngest heap generation of the process. This generation includes the process stack. This information is highly implementation-dependent, and can change if the implementation changes. |
| erlang_vm_dist_proc_min_heap_size_words                 | The minimum heap size for the process.                                                                                                                                                                           |
| erlang_vm_dist_proc_min_bin_vheap_size_words            | The minimum binary virtual heap size for the process.                                                                                                                                                            |
| erlang_vm_dist_proc_stack_size_words                    | The stack size, in words, of the process.                                                                                                                                                                        |
| erlang_vm_dist_proc_total_heap_size_words               | The total size, in words, of all heap fragments of the process. This includes the process stack and any unreceived messages that are considered to be part of the heap.                                          |
| erlang_vm_dist_proc_message_queue_len                   | The number of messages currently in the message queue of the process.                                                                                                                                            |
| erlang_vm_dist_proc_reductions                          | The number of reductions executed by the process.                                                                                                                                                                |
| erlang_vm_dist_proc_status                              | The current status of the distribution process. The status is represented as a numerical value where `exiting=1', `suspended=2', `runnable=3', `garbage_collecting=4', `running=5' and `waiting=6'.              |
| erlang_vm_dist_node_state                               | The current state of the distribution link. The state is represented as a numerical value where `pending=1', `up_pending=2' and `up=3'.                                                                          |
| erlang_vm_memory_atom_bytes_total                       | The total amount of memory currently allocated for atoms. This memory is part of the memory presented as system memory.                                                                                          |
| erlang_vm_memory_bytes_total                            | The total amount of memory currently allocated. This is the same as the sum of the memory size for processes and system.                                                                                         |
| erlang_vm_memory_dets_tables                            | Erlang VM DETS Tables count.                                                                                                                                                                                     |
| erlang_vm_memory_ets_tables                             | Erlang VM ETS Tables count.                                                                                                                                                                                      |
| erlang_vm_memory_processes_bytes_total                  | The total amount of memory currently allocated for the Erlang processes.                                                                                                                                         |
| erlang_vm_memory_system_bytes_total                     | The total amount of memory currently allocated for the emulator that is not directly related to any Erlang process. Memory presented as processes is not included in this memory.                                |
| erlang_vm_statistics_bytes_output_total                 | Total number of bytes output to ports.                                                                                                                                                                           |
| erlang_vm_statistics_bytes_received_total               | Total number of bytes received through ports.                                                                                                                                                                    |
| erlang_vm_statistics_context_switches                   | Total number of context switches since the system started.                                                                                                                                                       |
| erlang_vm_statistics_dirty_cpu_run_queue_length         | Length of the dirty CPU run-queue.                                                                                                                                                                               |
| erlang_vm_statistics_dirty_io_run_queue_length          | Length of the dirty IO run-queue.                                                                                                                                                                                |
| erlang_vm_statistics_garbage_collection_number_of_gcs   | Garbage collection: number of GCs.                                                                                                                                                                               |
| erlang_vm_statistics_garbage_collection_bytes_reclaimed | Garbage collection: bytes reclaimed.                                                                                                                                                                             |
| erlang_vm_statistics_garbage_collection_words_reclaimed | Garbage collection: words reclaimed.                                                                                                                                                                             |
| erlang_vm_statistics_reductions_total                   | Total reductions.                                                                                                                                                                                                |
| erlang_vm_statistics_run_queues_length_total            | Length of normal run-queues.                                                                                                                                                                                     |
| erlang_vm_statistics_wallclock_time_milliseconds        | Information about wall clock. Same as erlang_vm_statistics_runtime_milliseconds except that real time is measured.                                                                                               |
| erlang_vm_statistics_runtime_milliseconds               | The sum of the runtime for all threads in the Erlang runtime system. Can be greater than wall clock time.                                                                                                        |
| erlang_vm_statistics_wallclock_time_milliseconds        | Information about wall clock. Same as erlang_vm_statistics_runtime_milliseconds except that real time is measured.                                                                                               |
| erlang_vm_dirty_cpu_schedulers                          | The number of scheduler dirty CPU scheduler threads used by the emulator.                                                                                                                                        |
| erlang_vm_dirty_cpu_schedulers_online                   | The number of dirty CPU scheduler threads online.                                                                                                                                                                |
| erlang_vm_dirty_io_schedulers                           | The number of scheduler dirty I/O scheduler threads used by the emulator.                                                                                                                                        |
| erlang_vm_ets_limit                                     | The maximum number of ETS tables allowed.                                                                                                                                                                        |
| erlang_vm_logical_processors                            | The detected number of logical processors configured in the system.                                                                                                                                              |
| erlang_vm_logical_processors_available                  | The detected number of logical processors available to the Erlang runtime system.                                                                                                                                |
| erlang_vm_logical_processors_online                     | The detected number of logical processors online on the system.                                                                                                                                                  |
| erlang_vm_port_count                                    | The number of ports currently existing at the local node.                                                                                                                                                        |
| erlang_vm_port_limit                                    | The maximum number of simultaneously existing ports at the local node.                                                                                                                                           |
| erlang_vm_process_count                                 | The number of processes currently existing at the local node.                                                                                                                                                    |
| erlang_vm_process_limit                                 | The maximum number of simultaneously existing processes at the local node.                                                                                                                                       |
| erlang_vm_schedulers                                    | The number of scheduler threads used by the emulator.                                                                                                                                                            |
| erlang_vm_schedulers_online                             | The number of schedulers online.                                                                                                                                                                                 |
| erlang_vm_smp_support                                   | 1 if the emulator has been compiled with SMP support, otherwise 0.                                                                                                                                               |
| erlang_vm_threads                                       | 1 if the emulator has been compiled with thread support, otherwise 0.                                                                                                                                            |
| erlang_vm_thread_pool_size                              | The number of async threads in the async thread pool used for asynchronous driver calls.                                                                                                                         |
| erlang_vm_time_correction                               | 1 if time correction is enabled, otherwise 0.                                                                                                                                                                    |
| erlang_vm_atom_count                                    | The number of atom currently existing at the local node.                                                                                                                                                         |
| erlang_vm_atom_limit                                    | The maximum number of simultaneously existing atom at the local node.                                                                                                                                            |
| erlang_vm_allocators                                    | Allocated (carriers_size) and used (blocks_size) memory for the different allocators in the VM. See erts_alloc(3).                                                                                               |
