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Current metrics in JSON format:
{
  "deliver_message_latency_rollup": {
    "help": "how long a deliver_message call takes for a given protocol",
    "type": "histogram",
    "value": {
      "service": {
        "lua": {
          "avg": 0.09268276726712325,
          "bucket": [
            [
              0.005,
              1.0
            ],
            [
              0.01,
              154.0
            ],
            [
              0.025,
              285.0
            ],
            [
              0.05,
              291.0
            ],
            [
              0.1,
              459.0
            ],
            [
              0.25,
              477.0
            ],
            [
              0.5,
              583.0
            ],
            [
              1.0,
              583.0
            ],
            [
              2.5,
              584.0
            ],
            [
              5.0,
              584.0
            ],
            [
              10.0,
              584.0
            ]
          ],
          "count": 584,
          "sum": 54.12673608399998
        }
      }
    }
  },
  "disk_free_bytes": {
    "help": "number of available bytes in a monitored location",
    "type": "gauge",
    "value": {
      "name": {
        "data spool": 75509514240,
        "log dir /var/log/kumomta": 75509514240,
        "meta spool": 75509514240
      }
    }
  },
  "disk_free_inodes": {
    "help": "number of available inodes in a monitored location",
    "type": "gauge",
    "value": {
      "name": {
        "data spool": 11998172,
        "log dir /var/log/kumomta": 11998172,
        "meta spool": 11998172
      }
    }
  },
  "disk_free_inodes_percent": {
    "help": "percentage of available inodes in a monitored location",
    "type": "gauge",
    "value": {
      "name": {
        "data spool": 92,
        "log dir /var/log/kumomta": 92,
        "meta spool": 92
      }
    }
  },
  "disk_free_percent": {
    "help": "percentage of available bytes in a monitored location",
    "type": "gauge",
    "value": {
      "name": {
        "data spool": 73,
        "log dir /var/log/kumomta": 73,
        "meta spool": 73
      }
    }
  },
  "dns_mx_resolve_cache_hit": {
    "help": "total number of MailExchanger::resolve calls satisfied by level 1 cache",
    "type": "counter",
    "value": 149398
  },
  "dns_mx_resolve_cache_miss": {
    "help": "total number of MailExchanger::resolve calls that resulted in an MX DNS request to the next level of cache",
    "type": "counter",
    "value": 11800
  },
  "dns_mx_resolve_in_progress": {
    "help": "number of MailExchanger::resolve calls currently in progress",
    "type": "gauge",
    "value": 0
  },
  "dns_mx_resolve_status_fail": {
    "help": "total number of failed MailExchanger::resolve calls",
    "type": "counter",
    "value": 11507
  },
  "dns_mx_resolve_status_ok": {
    "help": "total number of successful MailExchanger::resolve calls",
    "type": "counter",
    "value": 149691
  },
  "log_submit_latency": {
    "help": "latency of log event submission operations",
    "type": "histogram",
    "value": {
      "logger": {
        "dir-/var/log/kumomta": {
          "avg": 0.000006709528056704075,
          "bucket": [
            [
              0.005,
              3386.0
            ],
            [
              0.01,
              3386.0
            ],
            [
              0.025,
              3386.0
            ],
            [
              0.05,
              3386.0
            ],
            [
              0.1,
              3386.0
            ],
            [
              0.25,
              3386.0
            ],
            [
              0.5,
              3386.0
            ],
            [
              1.0,
              3386.0
            ],
            [
              2.5,
              3386.0
            ],
            [
              5.0,
              3386.0
            ],
            [
              10.0,
              3386.0
            ]
          ],
          "count": 3386,
          "sum": 0.022718462
        },
        "hook-amqp": {
          "avg": 0.000003085422327229779,
          "bucket": [
            [
              0.005,
              3386.0
            ],
            [
              0.01,
              3386.0
            ],
            [
              0.025,
              3386.0
            ],
            [
              0.05,
              3386.0
            ],
            [
              0.1,
              3386.0
            ],
            [
              0.25,
              3386.0
            ],
            [
              0.5,
              3386.0
            ],
            [
              1.0,
              3386.0
            ],
            [
              2.5,
              3386.0
            ],
            [
              5.0,
              3386.0
            ],
            [
              10.0,
              3386.0
            ]
          ],
          "count": 3386,
          "sum": 0.010447240000000033
        },
        "hook-http://127.0.0.1:8008.tsa.kumomta": {
          "avg": 0.0000016577060537390742,
          "bucket": [
            [
              0.005,
              3089.0
            ],
            [
              0.01,
              3089.0
            ],
            [
              0.025,
              3089.0
            ],
            [
              0.05,
              3089.0
            ],
            [
              0.1,
              3089.0
            ],
            [
              0.25,
              3089.0
            ],
            [
              0.5,
              3089.0
            ],
            [
              1.0,
              3089.0
            ],
            [
              2.5,
              3089.0
            ],
            [
              5.0,
              3089.0
            ],
            [
              10.0,
              3089.0
            ]
          ],
          "count": 3089,
          "sum": 0.0051206540000000005
        },
        "hook-ndr_generator": {
          "avg": 0.000009821778795038385,
          "bucket": [
            [
              0.005,
              3385.0
            ],
            [
              0.01,
              3386.0
            ],
            [
              0.025,
              3386.0
            ],
            [
              0.05,
              3386.0
            ],
            [
              0.1,
              3386.0
            ],
            [
              0.25,
              3386.0
            ],
            [
              0.5,
              3386.0
            ],
            [
              1.0,
              3386.0
            ],
            [
              2.5,
              3386.0
            ],
            [
              5.0,
              3386.0
            ],
            [
              10.0,
              3386.0
            ]
          ],
          "count": 3386,
          "sum": 0.03325654299999997
        },
        "hook-postmastery-webhook": {
          "avg": 0.0000013105437572928794,
          "bucket": [
            [
              0.005,
              2571.0
            ],
            [
              0.01,
              2571.0
            ],
            [
              0.025,
              2571.0
            ],
            [
              0.05,
              2571.0
            ],
            [
              0.1,
              2571.0
            ],
            [
              0.25,
              2571.0
            ],
            [
              0.5,
              2571.0
            ],
            [
              1.0,
              2571.0
            ],
            [
              2.5,
              2571.0
            ],
            [
              5.0,
              2571.0
            ],
            [
              10.0,
              2571.0
            ]
          ],
          "count": 2571,
          "sum": 0.003369407999999993
        },
        "hook-webhook_lambda": {
          "avg": 0.000006547823685764904,
          "bucket": [
            [
              0.005,
              3386.0
            ],
            [
              0.01,
              3386.0
            ],
            [
              0.025,
              3386.0
            ],
            [
              0.05,
              3386.0
            ],
            [
              0.1,
              3386.0
            ],
            [
              0.25,
              3386.0
            ],
            [
              0.5,
              3386.0
            ],
            [
              1.0,
              3386.0
            ],
            [
              2.5,
              3386.0
            ],
            [
              5.0,
              3386.0
            ],
            [
              10.0,
              3386.0
            ]
          ],
          "count": 3386,
          "sum": 0.022170930999999967
        },
        "hook-webhook_tatami": {
          "avg": 0.000009929379208505601,
          "bucket": [
            [
              0.005,
              3386.0
            ],
            [
              0.01,
              3386.0
            ],
            [
              0.025,
              3386.0
            ],
            [
              0.05,
              3386.0
            ],
            [
              0.1,
              3386.0
            ],
            [
              0.25,
              3386.0
            ],
            [
              0.5,
              3386.0
            ],
            [
              1.0,
              3386.0
            ],
            [
              2.5,
              3386.0
            ],
            [
              5.0,
              3386.0
            ],
            [
              10.0,
              3386.0
            ]
          ],
          "count": 3386,
          "sum": 0.033620877999999965
        }
      }
    }
  },
  "lruttl_cache_size": {
    "help": "number of items contained in an lruttl cache",
    "type": "gauge",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 0,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 11,
        "egress_source_pools": 1,
        "egress_source_sources": 1,
        "http_server_auth": 0,
        "listener_domains_data": 0,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 0,
        "rfc5321_rustls_config": 0,
        "shaping_data": 1,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 0,
        "sources_data": 0
      }
    }
  },
  "lruttl_error_count": {
    "help": "how many times a lruttl cache population resulted in an error",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 0,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 0,
        "egress_source_pools": 0,
        "egress_source_sources": 0,
        "http_server_auth": 0,
        "listener_domains_data": 0,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 0,
        "rfc5321_rustls_config": 0,
        "shaping_data": 0,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 0,
        "sources_data": 0
      }
    }
  },
  "lruttl_evict_count": {
    "help": "how many times a lruttl cache evicted an item due to capacity constraints",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 0,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 0,
        "egress_source_pools": 0,
        "egress_source_sources": 0,
        "http_server_auth": 0,
        "listener_domains_data": 0,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 0,
        "rfc5321_rustls_config": 0,
        "shaping_data": 0,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 0,
        "sources_data": 0
      }
    }
  },
  "lruttl_expire_count": {
    "help": "how many times a lruttl cache removed an item due to ttl expiration",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 3,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 11789,
        "egress_source_pools": 5206,
        "egress_source_sources": 5206,
        "http_server_auth": 0,
        "listener_domains_data": 3,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 3,
        "rfc5321_rustls_config": 0,
        "shaping_data": 5345,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 69,
        "sources_data": 0
      }
    }
  },
  "lruttl_hit_count": {
    "help": "how many times a lruttl cache lookup was a hit for a given cache",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 0,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 126584,
        "egress_source_pools": 1940,
        "egress_source_sources": 2132,
        "http_server_auth": 0,
        "listener_domains_data": 2,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 0,
        "rfc5321_rustls_config": 0,
        "shaping_data": 5536,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 5,
        "sources_data": 0
      }
    }
  },
  "lruttl_insert_count": {
    "help": "how many times a lruttl cache was populated via unconditional insert",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 0,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 0,
        "egress_source_pools": 0,
        "egress_source_sources": 0,
        "http_server_auth": 0,
        "listener_domains_data": 0,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 0,
        "rfc5321_rustls_config": 0,
        "shaping_data": 0,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 0,
        "sources_data": 0
      }
    }
  },
  "lruttl_lookup_count": {
    "help": "how many times a lruttl cache lookup was initiated for a given cache",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 3,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 161198,
        "egress_source_pools": 7147,
        "egress_source_sources": 7339,
        "http_server_auth": 0,
        "listener_domains_data": 5,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 3,
        "rfc5321_rustls_config": 0,
        "shaping_data": 10882,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 74,
        "sources_data": 0
      }
    }
  },
  "lruttl_miss_count": {
    "help": "how many times a lruttl cache lookup was a miss for a given cache",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 3,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 34614,
        "egress_source_pools": 5207,
        "egress_source_sources": 5207,
        "http_server_auth": 0,
        "listener_domains_data": 3,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 3,
        "rfc5321_rustls_config": 0,
        "shaping_data": 5346,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 69,
        "sources_data": 0
      }
    }
  },
  "lruttl_populated_count": {
    "help": "how many times a lruttl cache lookup resulted in performing the work to populate the entry",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 3,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 11800,
        "egress_source_pools": 5207,
        "egress_source_sources": 5207,
        "http_server_auth": 0,
        "listener_domains_data": 3,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 3,
        "rfc5321_rustls_config": 0,
        "shaping_data": 5346,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 69,
        "sources_data": 0
      }
    }
  },
  "lruttl_stale_count": {
    "help": "how many times a lruttl cache population was satisfied by a stale value",
    "type": "counter",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 0,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 0,
        "egress_source_pools": 0,
        "egress_source_sources": 0,
        "http_server_auth": 0,
        "listener_domains_data": 0,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 0,
        "rfc5321_rustls_config": 0,
        "shaping_data": 0,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 0,
        "sources_data": 0
      }
    }
  },
  "lruttl_waiting_populate": {
    "help": "how many tasks are currently waiting for a cache entry to populate",
    "type": "gauge",
    "value": {
      "cache_name": {
        "dkim_key_cache": 0,
        "dkim_signer_cache": 0,
        "dkim_signing_data": 0,
        "dns_resolver_ip": 0,
        "dns_resolver_ipv4": 0,
        "dns_resolver_ipv6": 0,
        "dns_resolver_mx": 0,
        "egress_source_pools": 0,
        "egress_source_sources": 0,
        "http_server_auth": 0,
        "listener_domains_data": 0,
        "mod_filesystem_glob_cache": 0,
        "mta_sts_policy": 0,
        "queue.lua_resolve_provider": 0,
        "queue_helper_data": 0,
        "rfc5321_rustls_config": 0,
        "shaping_data": 0,
        "smtp_dispatcher_broken_tls": 0,
        "smtp_dispatcher_client_certificate": 0,
        "smtp_server_tls_config": 0,
        "sources_data": 0
      }
    }
  },
  "lua_count": {
    "help": "the number of lua contexts currently alive",
    "type": "gauge",
    "value": 4
  },
  "lua_event_latency": {
    "help": "how long a given lua event callback took",
    "type": "histogram",
    "value": {
      "event": {
        "context-creation": {
          "avg": 0.0032443943957263716,
          "bucket": [
            [
              0.005,
              7034.0
            ],
            [
              0.01,
              7173.0
            ],
            [
              0.025,
              7201.0
            ],
            [
              0.05,
              7203.0
            ],
            [
              0.1,
              7205.0
            ],
            [
              0.25,
              7207.0
            ],
            [
              0.5,
              7207.0
            ],
            [
              1.0,
              7207.0
            ],
            [
              2.5,
              7207.0
            ],
            [
              5.0,
              7207.0
            ],
            [
              10.0,
              7207.0
            ]
          ],
          "count": 7207,
          "sum": 23.38235040999996
        },
        "get_egress_path_config": {
          "avg": 0.022718103328125,
          "bucket": [
            [
              0.005,
              34.0
            ],
            [
              0.01,
              34.0
            ],
            [
              0.025,
              111.0
            ],
            [
              0.05,
              183.0
            ],
            [
              0.1,
              192.0
            ],
            [
              0.25,
              192.0
            ],
            [
              0.5,
              192.0
            ],
            [
              1.0,
              192.0
            ],
            [
              2.5,
              192.0
            ],
            [
              5.0,
              192.0
            ],
            [
              10.0,
              192.0
            ]
          ],
          "count": 192,
          "sum": 4.361875839
        },
        "get_listener_domain": {
          "avg": 0.0005512382000000001,
          "bucket": [
            [
              0.005,
              5.0
            ],
            [
              0.01,
              5.0
            ],
            [
              0.025,
              5.0
            ],
            [
              0.05,
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    "help": "soft memory limit measured in bytes",
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    "help": "low memory threshold measured in bytes",
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    "help": "number of bytes of used memory (allocated by Rust)",
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    "help": "how long it takes to load message data from spool",
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    "help": "total number of Message objects with body data loaded",
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    "help": "Approximate memory usage by cache",
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    "help": "Approximate memory usage of all the table readers",
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    "help": "Approximate memory usage of all the mem-tables",
    "type": "gauge",
    "value": {
      "path": {
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    "help": "Approximate memory usage of un-flushed mem-tables",
    "type": "gauge",
    "value": {
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        "/var/spool/kumomta/meta": 1050624
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    }
  },
  "scheduled_count_total": {
    "help": "total number of messages across all scheduled queues",
    "type": "gauge",
    "value": 74
  },
  "scheduled_queue_count": {
    "help": "how many scheduled queues are tracked by the QueueManager",
    "type": "gauge",
    "value": 1
  },
  "smtpsrv_process_data_duration": {
    "help": "how long it takes to process the DATA portion and enqueue",
    "type": "histogram",
    "value": {
      "avg": 0.11887359000000002,
      "bucket": [
        [
          0.005,
          0.0
        ],
        [
          0.01,
          0.0
        ],
        [
          0.025,
          0.0
        ],
        [
          0.05,
          0.0
        ],
        [
          0.1,
          2.0
        ],
        [
          0.25,
          3.0
        ],
        [
          0.5,
          3.0
        ],
        [
          1.0,
          3.0
        ],
        [
          2.5,
          3.0
        ],
        [
          5.0,
          3.0
        ],
        [
          10.0,
          3.0
        ]
      ],
      "count": 3,
      "sum": 0.35662077000000003
    }
  },
  "smtpsrv_read_data_duration": {
    "help": "how long it takes to receive the DATA portion",
    "type": "histogram",
    "value": {
      "avg": 0.28053442733333334,
      "bucket": [
        [
          0.005,
          0.0
        ],
        [
          0.01,
          0.0
        ],
        [
          0.025,
          0.0
        ],
        [
          0.05,
          0.0
        ],
        [
          0.1,
          0.0
        ],
        [
          0.25,
          2.0
        ],
        [
          0.5,
          3.0
        ],
        [
          1.0,
          3.0
        ],
        [
          2.5,
          3.0
        ],
        [
          5.0,
          3.0
        ],
        [
          10.0,
          3.0
        ]
      ],
      "count": 3,
      "sum": 0.841603282
    }
  },
  "smtpsrv_transaction_duration": {
    "help": "how long an incoming SMTP transaction takes",
    "type": "histogram",
    "value": {
      "avg": 0.7938387923333333,
      "bucket": [
        [
          0.005,
          0.0
        ],
        [
          0.01,
          0.0
        ],
        [
          0.025,
          0.0
        ],
        [
          0.05,
          0.0
        ],
        [
          0.1,
          0.0
        ],
        [
          0.25,
          0.0
        ],
        [
          0.5,
          0.0
        ],
        [
          1.0,
          3.0
        ],
        [
          2.5,
          3.0
        ],
        [
          5.0,
          3.0
        ],
        [
          10.0,
          3.0
        ]
      ],
      "count": 3,
      "sum": 2.381516377
    }
  },
  "thread_pool_parked": {
    "help": "number of parked(idle) threads in a thread pool",
    "type": "gauge",
    "value": {
      "pool": {
        "localset": 0,
        "logging": 1,
        "qmaint": 1,
        "readyq": 1,
        "readyq_maint": 1,
        "smtpsrv": 1,
        "spoolin": 1
      }
    }
  },
  "thread_pool_size": {
    "help": "number of threads in a thread pool",
    "type": "gauge",
    "value": {
      "pool": {
        "localset": 1,
        "logging": 1,
        "qmaint": 1,
        "readyq": 1,
        "readyq_maint": 1,
        "smtpsrv": 1,
        "spoolin": 1
      }
    }
  },
  "timeq_pop_interval": {
    "help": "The amount of time that passes between calls to TimeQ::pop",
    "type": "histogram",
    "value": {
      "avg": 3.0010955508413693,
      "bucket": [
        [
          3.0,
          0.0
        ],
        [
          4.0,
          106946.0
        ],
        [
          5.0,
          106946.0
        ],
        [
          8.0,
          106946.0
        ],
        [
          10.0,
          106946.0
        ],
        [
          12.0,
          106946.0
        ],
        [
          15.0,
          106946.0
        ],
        [
          20.0,
          106946.0
        ],
        [
          25.0,
          106946.0
        ],
        [
          30.0,
          106946.0
        ]
      ],
      "count": 106946,
      "sum": 320955.1647802811
    }
  },
  "timeq_pop_latency": {
    "help": "The amount of time that passes between calls to a singleon timerwheel pop",
    "type": "histogram",
    "value": {
      "avg": 0.000003032083630991325,
      "bucket": [
        [
          0.005,
          106946.0
        ],
        [
          0.01,
          106946.0
        ],
        [
          0.025,
          106946.0
        ],
        [
          0.05,
          106946.0
        ],
        [
          0.1,
          106946.0
        ],
        [
          0.25,
          106946.0
        ],
        [
          0.5,
          106946.0
        ],
        [
          1.0,
          106946.0
        ],
        [
          2.5,
          106946.0
        ],
        [
          5.0,
          106946.0
        ],
        [
          10.0,
          106946.0
        ]
      ],
      "count": 106946,
      "sum": 0.32426921599999825
    }
  },
  "timeq_pop_tardiness": {
    "help": "The time difference between the due and current time for a singleon timerwheel pop",
    "type": "histogram",
    "value": {
      "avg": 1.032449351107329,
      "bucket": [
        [
          0.25,
          796.0
        ],
        [
          0.5,
          923.0
        ],
        [
          1.0,
          1117.0
        ],
        [
          2.5,
          1441.0
        ],
        [
          3.0,
          1556.0
        ],
        [
          5.0,
          1692.0
        ],
        [
          10.0,
          1733.0
        ],
        [
          15.0,
          1733.0
        ]
      ],
      "count": 1733,
      "sum": 1789.2347254690012
    }
  },
  "timeq_reinsert_tardiness": {
    "help": "The time difference between the due and current time for a singleon timerwheel reinsertion",
    "type": "histogram",
    "value": {
      "avg": 18.126645269657416,
      "bucket": [
        [
          0.25,
          438.0
        ],
        [
          0.5,
          479.0
        ],
        [
          1.0,
          672.0
        ],
        [
          2.5,
          1138.0
        ],
        [
          3.0,
          1251.0
        ],
        [
          5.0,
          1391.0
        ],
        [
          10.0,
          1432.0
        ],
        [
          15.0,
          1435.0
        ],
        [
          30.0,
          1436.0
        ],
        [
          45.0,
          1437.0
        ],
        [
          60.0,
          1437.0
        ],
        [
          90.0,
          1437.0
        ],
        [
          180.0,
          1437.0
        ],
        [
          360.0,
          1437.0
        ],
        [
          720.0,
          1437.0
        ]
      ],
      "count": 1442,
      "sum": 26138.622478845995
    }
  },
  "tokio_budget_forced_yield_count": {
    "help": "Returns the number of times that tasks have been forced to yield back to the scheduler after exhausting their task budgets.",
    "type": "counter",
    "value": 0
  },
  "tokio_elapsed": {
    "help": "Total amount of time elapsed since observing runtime metrics.",
    "type": "counter",
    "value": 320959.880542688
  },
  "tokio_global_queue_depth": {
    "help": "The number of tasks currently scheduled in the runtime’s injection queue.",
    "type": "gauge",
    "value": 0
  },
  "tokio_io_driver_ready_count": {
    "help": "Returns the number of ready events processed by the runtime’s I/O driver.",
    "type": "counter",
    "value": 0
  },
  "tokio_num_remote_schedules": {
    "help": "The number of tasks scheduled from outside of the runtime.",
    "type": "counter",
    "value": 11722
  },
  "tokio_total_busy_duration": {
    "help": "The amount of time worker threads were busy.",
    "type": "counter",
    "value": 29.341729831999988
  },
  "tokio_total_local_queue_depth": {
    "help": "The total number of tasks currently scheduled in workers’ local queues.",
    "type": "gauge",
    "value": 0
  },
  "tokio_total_local_schedule_count": {
    "help": "The number of tasks scheduled from worker threads.",
    "type": "counter",
    "value": 64903
  },
  "tokio_total_noop_count": {
    "help": "The number of times worker threads unparked but performed no work before parking again.",
    "type": "counter",
    "value": 125498
  },
  "tokio_total_overflow_count": {
    "help": "The number of times worker threads saturated their local queues.",
    "type": "counter",
    "value": 0
  },
  "tokio_total_park_count": {
    "help": "The number of times worker threads parked.",
    "type": "counter",
    "value": 202122
  },
  "tokio_total_polls_count": {
    "help": "The number of tasks that have been polled across all worker threads.",
    "type": "counter",
    "value": 76625
  },
  "tokio_total_steal_count": {
    "help": "The number of tasks worker threads stole from another worker thread.",
    "type": "counter",
    "value": 0
  },
  "tokio_total_steal_operations": {
    "help": "The number of times worker threads stole tasks from another worker thread.",
    "type": "counter",
    "value": 0
  },
  "tokio_workers_count": {
    "help": "The number of worker threads used by the runtime.",
    "type": "gauge",
    "value": 2
  },
  "total_qmaint_runs": {
    "help": "total number of times a scheduled queue maintainer was run",
    "type": "counter",
    "value": 106946
  },
  "total_readyq_runs": {
    "help": "total number of times a readyq maintainer was run",
    "type": "counter",
    "value": 880
  },
  "connection_count": {
    "help": "number of active connections",
    "type": "gauge",
    "value": {
      "service": {
        "lua": 0,
        "esmtp_listener": 0
      }
    }
  },
  "total_connections_denied": {
    "help": "total number of connections rejected due to load shedding or concurrency limits",
    "type": "counter",
    "value": {
      "service": {
        "esmtp_listener": 0
      }
    }
  },
  "scheduled_by_domain": {
    "help": "number of messages in the scheduled queue for a specific domain",
    "type": "gauge",
    "value": {
      "domain": {
        "amqp.log_hook": 74
      }
    }
  },
  "scheduled_count": {
    "help": "number of messages in the scheduled queue",
    "type": "gauge",
    "value": {
      "queue": {
        "amqp.log_hook": 74
      }
    }
  },
  "queued_count_by_provider": {
    "help": "number of messages in the scheduled and ready queue",
    "type": "gauge",
    "value": {
      "provider": {
        "NXDOMAIN:amqp.log_hook": 74
      }
    }
  },
  "queued_count_by_provider_and_pool": {
    "help": "number of messages in the scheduled and ready queue",
    "type": "gauge",
    "value": [
      {
        "provider": "NXDOMAIN:amqp.log_hook",
        "pool": "unspecified",
        "@": 74
      }
    ]
  },
  "total_messages_received": {
    "help": "total number of messages ever received",
    "type": "counter",
    "value": {
      "service": {
        "esmtp_listener:172.31.26.3:25": 2,
        "esmtp_listener:172.31.26.3:587": 1,
        "esmtp_listener": 3
      }
    }
  },
  "smtp_server_rejections": {
    "help": "number of Rejection records logged by the smtp server",
    "type": "counter",
    "value": {
      "service": {
        "total": 294,
        "172.31.26.3:25": 158,
        "172.31.26.3:587": 136
      }
    }
  },
  "total_connection_count": {
    "help": "total number of active connections ever made",
    "type": "counter",
    "value": {
      "service": {
        "lua": 232
      }
    }
  },
  "ready_count": {
    "help": "number of messages in the ready queue",
    "type": "gauge",
    "value": {
      "service": {
        "lua": 0
      }
    }
  },
  "total_messages_delivered": {
    "help": "total number of messages ever delivered",
    "type": "counter",
    "value": {
      "service": {
        "lua": 292
      }
    }
  },
  "total_messages_transfail": {
    "help": "total number of message delivery attempts that transiently failed",
    "type": "counter",
    "value": {
      "service": {
        "lua": 0
      }
    }
  },
  "total_messages_fail": {
    "help": "total number of message delivery attempts that permanently failed",
    "type": "counter",
    "value": {
      "service": {
        "lua": 292
      }
    }
  },
  "total_messages_fail_by_provider_and_source": {
    "help": "total number of message delivery attempts that permanently failed",
    "type": "counter",
    "value": null
  },
  "total_messages_delivered_by_provider_and_source": {
    "help": "total number of messages ever delivered",
    "type": "counter",
    "value": null
  },
  "total_messages_transfail_by_provider_and_source": {
    "help": "total number of message delivery attempts that transiently failed",
    "type": "counter",
    "value": null
  },
  "total_messages_fail_by_provider": {
    "help": "total number of message delivery attempts that permanently failed",
    "type": "counter",
    "value": null
  },
  "total_messages_delivered_by_provider": {
    "help": "total number of messages ever delivered",
    "type": "counter",
    "value": null
  },
  "total_messages_transfail_by_provider": {
    "help": "total number of message delivery attempts that transiently failed",
    "type": "counter",
    "value": null
  },
  "connection_count_by_provider": {
    "help": "number of active connections",
    "type": "gauge",
    "value": null
  },
  "connection_count_by_provider_and_pool": {
    "help": "number of active connections",
    "type": "gauge",
    "value": null
  },
  "ready_full": {
    "help": "number of times a message could not fit in the ready queue",
    "type": "counter",
    "value": null
  },
  "delayed_due_to_throttle_insert_ready": {
    "help": "number of times a message was delayed due throttle_insert_ready_queue event",
    "type": "counter",
    "value": {
      "queue": {
        "amqp.log_hook": 19
      }
    }
  }
}

Documentation for metrics
https://docs.kumomta.com/reference/http/metrics.json/