}test@test:~$ sudo mtail -one_shot --vmodule=tailer=2 -logtostderr -progs /etc/mtail/haproxy.mtail -logs /var/log/haproxy.log
I0503 06:51:56.775081  524235 main.go:119] mtail version 3.0.0-rc51 git revision 6fdbf8ec96a63c674c53148eeb9ec96043a2ec9c go version go1.19.4 go arch amd64 go os linux
I0503 06:51:56.775148  524235 main.go:120] Commandline: ["mtail" "-one_shot" "--vmodule=tailer=2" "-logtostderr" "-progs" "/etc/mtail/haproxy.mtail" "-logs" "/var/log/haproxy.log"]
I0503 06:51:56.775595  524235 store.go:189] Starting metric store expiry loop every 1h0m0s
I0503 06:51:56.779058  524235 checker.go:254] capture group reference `hostname' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779086  524235 checker.go:254] capture group reference `message' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779092  524235 checker.go:254] capture group reference `date' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779097  524235 checker.go:254] capture group reference `message' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779101  524235 checker.go:254] capture group reference `application' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779105  524235 checker.go:254] capture group reference `application' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779110  524235 checker.go:254] capture group reference `hostname' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779288  524235 checker.go:254] capture group reference `pid' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779411  524235 checker.go:254] capture group reference `pid' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.779535  524235 checker.go:254] capture group reference `date' at haproxy.mtail:14:3-128 appears to be unused
I0503 06:51:56.781113  524235 checker.go:254] capture group reference `srv_conn' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.781251  524235 checker.go:254] capture group reference `24' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.781373  524235 checker.go:254] capture group reference `URI' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.781497  524235 checker.go:254] capture group reference `termination_state' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.781629  524235 checker.go:254] capture group reference `feconn' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.781763  524235 checker.go:254] capture group reference `beconn' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.781888  524235 checker.go:254] capture group reference `srv_conn' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782006  524235 checker.go:254] capture group reference `1' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782134  524235 checker.go:254] capture group reference `termination_state' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782255  524235 checker.go:254] capture group reference `queue_time_ms' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782380  524235 checker.go:254] capture group reference `captured_response_cookie' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782507  524235 checker.go:254] capture group reference `beconn' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782627  524235 checker.go:254] capture group reference `srv_queue' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782749  524235 checker.go:254] capture group reference `backend_queue' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782877  524235 checker.go:254] capture group reference `backend_queue' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.782998  524235 checker.go:254] capture group reference `URI' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.783120  524235 checker.go:254] capture group reference `captured_request_cookie' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.783240  524235 checker.go:254] capture group reference `captured_request_cookie' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.783359  524235 checker.go:254] capture group reference `feconn' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.783480  524235 checker.go:254] capture group reference `captured_response_cookie' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.783597  524235 checker.go:254] capture group reference `queue_time_ms' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.783723  524235 checker.go:254] capture group reference `srv_queue' at haproxy.mtail:59:3-22 appears to be unused
I0503 06:51:56.784665  524235 checker.go:254] capture group reference `ssl_version' at haproxy.mtail:170:3-22 appears to be unused
I0503 06:51:56.784852  524235 checker.go:254] capture group reference `ssl_version' at haproxy.mtail:170:3-22 appears to be unused
I0503 06:51:56.784988  524235 checker.go:254] capture group reference `2' at haproxy.mtail:170:3-22 appears to be unused
I0503 06:51:56.785108  524235 checker.go:254] capture group reference `retries' at haproxy.mtail:170:3-22 appears to be unused
I0503 06:51:56.785238  524235 checker.go:254] capture group reference `1' at haproxy.mtail:170:3-22 appears to be unused
I0503 06:51:56.785357  524235 checker.go:254] capture group reference `retries' at haproxy.mtail:170:3-22 appears to be unused
I0503 06:51:56.788963  524235 runtime.go:188] Loaded program haproxy.mtail
I0503 06:51:56.789176  524235 logstream.go:61] Parsed url as /var/log/haproxy.log
I0503 06:51:56.789374  524235 filestream.go:278] signalling stop at next EOF
I0503 06:51:56.789497  524235 tail.go:287] Tailing /var/log/haproxy.log
I0503 06:51:56.789695  524235 tail.go:315] No gc loop in oneshot mode.
I0503 06:51:56.789688  524235 tail.go:343] No polling loop in oneshot mode.
I0503 06:51:56.789933  524235 runtime.go:288] END OF LINE
I0503 06:51:56.789724  524235 mtail.go:132] Listening on [::]:3903
I0503 06:51:56.790057  524235 vm.go:1059] VM "haproxy.mtail" finished
{
  "haproxy_active_connections": [
    {
      "Name": "haproxy_active_connections",
      "Program": "haproxy.mtail",
      "Kind": 2,
      "Type": 0,
      "Source": "haproxy.mtail:46:9-34"
    }
  ],
  "haproxy_connections_total": [
    {
      "Name": "haproxy_connections_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "frontend_name",
        "mode"
      ],
      "Source": "haproxy.mtail:34:11-35"
    }
  ],
  "haproxy_http_nosrv_total": [
    {
      "Name": "haproxy_http_nosrv_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "frontend_name_transport",
        "ssl_version",
        "backend_name",
        "status_code",
        "request_method",
        "http_version"
      ],
      "Source": "haproxy.mtail:50:11-34"
    }
  ],
  "haproxy_http_request_backend_duration_seconds_total": [
    {
      "Name": "haproxy_http_request_backend_duration_seconds_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 1,
      "Keys": [
        "frontend_name_transport",
        "ssl_version",
        "backend_name",
        "status_code",
        "request_method",
        "http_version"
      ],
      "Source": "haproxy.mtail:51:11-61"
    }
  ],
  "haproxy_http_request_client_duration_seconds_total": [
    {
      "Name": "haproxy_http_request_client_duration_seconds_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 1,
      "Keys": [
        "frontend_name_transport",
        "ssl_version",
        "backend_name",
        "status_code",
        "request_method",
        "http_version"
      ],
      "Source": "haproxy.mtail:52:11-60"
    }
  ],
  "haproxy_http_response_duration_seconds": [
    {
      "Name": "haproxy_http_response_duration_seconds",
      "Program": "haproxy.mtail",
      "Kind": 5,
      "Type": 3,
      "Keys": [
        "backend_name",
        "server_name"
      ],
      "Source": "haproxy.mtail:57:13-50",
      "Buckets": [
        {
          "Min": "0",
          "Max": "0.01"
        },
        {
          "Min": "0.01",
          "Max": "0.025"
        },
        {
          "Min": "0.025",
          "Max": "0.05"
        },
        {
          "Min": "0.05",
          "Max": "0.1"
        },
        {
          "Min": "0.1",
          "Max": "0.25"
        },
        {
          "Min": "0.25",
          "Max": "0.5"
        },
        {
          "Min": "0.5",
          "Max": "1"
        },
        {
          "Min": "1",
          "Max": "2.5"
        },
        {
          "Min": "2.5",
          "Max": "5"
        },
        {
          "Min": "5",
          "Max": "+Inf"
        }
      ]
    }
  ],
  "haproxy_ssh_active_backend_connections": [
    {
      "Name": "haproxy_ssh_active_backend_connections",
      "Program": "haproxy.mtail",
      "Kind": 2,
      "Type": 0,
      "Keys": [
        "backend"
      ],
      "Source": "haproxy.mtail:151:9-46"
    }
  ],
  "haproxy_ssh_active_connections": [
    {
      "Name": "haproxy_ssh_active_connections",
      "Program": "haproxy.mtail",
      "Kind": 2,
      "Type": 0,
      "Keys": [
        "server"
      ],
      "Source": "haproxy.mtail:152:9-38"
    }
  ],
  "haproxy_ssh_active_frontend_connections": [
    {
      "Name": "haproxy_ssh_active_frontend_connections",
      "Program": "haproxy.mtail",
      "Kind": 2,
      "Type": 0,
      "Source": "haproxy.mtail:150:9-47"
    }
  ],
  "haproxy_ssh_max_startups_breached_total": [
    {
      "Name": "haproxy_ssh_max_startups_breached_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "server_name"
      ],
      "Source": "haproxy.mtail:167:11-49"
    }
  ],
  "haproxy_ssh_request_connect_duration_seconds_total": [
    {
      "Name": "haproxy_ssh_request_connect_duration_seconds_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 1,
      "Keys": [
        "server_name"
      ],
      "Source": "haproxy.mtail:161:11-60"
    }
  ],
  "haproxy_ssh_request_duration_seconds": [
    {
      "Name": "haproxy_ssh_request_duration_seconds",
      "Program": "haproxy.mtail",
      "Kind": 5,
      "Type": 3,
      "Keys": [
        "server_name"
      ],
      "Source": "haproxy.mtail:163:13-48",
      "Buckets": [
        {
          "Min": "0",
          "Max": "0.25"
        },
        {
          "Min": "0.25",
          "Max": "0.5"
        },
        {
          "Min": "0.5",
          "Max": "1"
        },
        {
          "Min": "1",
          "Max": "2"
        },
        {
          "Min": "2",
          "Max": "4"
        },
        {
          "Min": "4",
          "Max": "8"
        },
        {
          "Min": "8",
          "Max": "16"
        },
        {
          "Min": "16",
          "Max": "32"
        },
        {
          "Min": "32",
          "Max": "64"
        },
        {
          "Min": "64",
          "Max": "128"
        },
        {
          "Min": "128",
          "Max": "+Inf"
        }
      ]
    }
  ],
  "haproxy_ssh_request_queue_duration_seconds_total": [
    {
      "Name": "haproxy_ssh_request_queue_duration_seconds_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 1,
      "Keys": [
        "server_name"
      ],
      "Source": "haproxy.mtail:162:11-58"
    }
  ],
  "haproxy_ssh_request_received_bytes_total": [
    {
      "Name": "haproxy_ssh_request_received_bytes_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "server_name"
      ],
      "Source": "haproxy.mtail:165:11-50"
    }
  ],
  "haproxy_ssh_request_sent_bytes_total": [
    {
      "Name": "haproxy_ssh_request_sent_bytes_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "server_name"
      ],
      "Source": "haproxy.mtail:166:11-46"
    }
  ],
  "haproxy_ssh_requests_terminated_total": [
    {
      "Name": "haproxy_ssh_requests_terminated_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "server_name",
        "cause",
        "state"
      ],
      "Source": "haproxy.mtail:148:11-47"
    }
  ],
  "haproxy_ssh_requests_total": [
    {
      "Name": "haproxy_ssh_requests_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "server_name"
      ],
      "Source": "haproxy.mtail:147:11-36"
    }
  ],
  "haproxy_ssl_handshake_failures_total": [
    {
      "Name": "haproxy_ssl_handshake_failures_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "LabelValues": [
        {
          "Value": {
            "Value": 0,
            "Time": 0
          }
        }
      ],
      "Source": "haproxy.mtail:40:11-46"
    }
  ],
  "http_request_backend_retries_total": [
    {
      "Name": "http_request_backend_retries_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "backend_name",
        "request_method"
      ],
      "Source": "haproxy.mtail:56:11-44"
    }
  ],
  "http_request_duration_seconds_total": [
    {
      "Name": "http_request_duration_seconds_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 1,
      "Keys": [
        "frontend_name_transport",
        "ssl_version",
        "backend_name",
        "status_code",
        "request_method",
        "http_version"
      ],
      "Source": "haproxy.mtail:53:11-45"
    }
  ],
  "http_request_received_bytes_total": [
    {
      "Name": "http_request_received_bytes_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "frontend_name_transport",
        "ssl_version",
        "backend_name",
        "status_code",
        "request_method",
        "http_version"
      ],
      "Source": "haproxy.mtail:55:11-43"
    }
  ],
  "http_request_sent_bytes_total": [
    {
      "Name": "http_request_sent_bytes_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "frontend_name_transport",
        "ssl_version",
        "backend_name",
        "status_code",
        "request_method",
        "http_version"
      ],
      "Source": "haproxy.mtail:54:11-39"
    }
  ],
  "http_requests_total": [
    {
      "Name": "http_requests_total",
      "Program": "haproxy.mtail",
      "Kind": 1,
      "Type": 0,
      "Keys": [
        "frontend_name_transport",
        "ssl_version",
        "backend_name",
        "status_code",
        "request_method",
        "http_version"
      ],
      "Source": "haproxy.mtail:49:11-29"
    }
  ]
}