lnav Monolog format

monolog.json

{
  "monolog": {
    "title": "Monolog log file",
    "description": "Monolog log format",
    "url": "https://github.com/Seldaek/monolog",
    "regex": {
      "default": {
        "pattern": "\\[(?P<timestamp>.*)\\] (?P<logger>\\w+).(?P<level>\\w+): (?P<message>.+) (?P<context>[\\[\\{].*[\\]\\}]) (?P<extra>[\\[\\{].*[\\]\\}])$"
      }
    },
    "level-field" : "level",
    "body-field" : "message",
    "level": {
        "fatal": "EMERGENCY",
        "critical": "ALERT|CRITICAL",
        "error": "ERROR",
        "warning": "WARNING",
        "stats": "NOTICE",
        "info": "INFO",
        "debug": "DEBUG"
    },
    "value": {
        "logger": {
            "kind": "string",
            "identifier": true
        },
        "level": {
            "kind": "string",
            "identifier": true
        },
        "message": {
            "kind": "string"
        },
        "context": {
            "kind": "json"
        },
        "extra": {
            "kind": "json"
        }
    },
    "sample": [
      {
        "line": "[2015-08-10 15:05:12] event.DEBUG: Notified event \"kernel.terminate\" to listener \"Symfony\\Component\\HttpKernel\\EventListener\\ProfilerListener::onKernelTerminate\". [] []"
      }
    ]
  }
}

Updated. Seems to work for my current logs.

Thanks @nickpeirson, works great!