statsd logger sketch

example.py

import logging
import os

from logging.handlers import DatagramHandler

HOST_KEY = "STATSD_HOST"
PORT_KEY = "STATSD_PORT"

logger = logging.getLogger("test")


class StatsdHandler(DatagramHandler):
    def _metric(self, record):
        return "errors.{}.{}.{}_{}".format(
            record.name, record.levelname, record.funcName, record.lineno
        )

    def _prepare_increment(self, metric):
        return "{}:1|c".format(metric)

    def emit(self, record):
        """
        Increment a statsd counter for the error that occurred.
        """
        try:
            s = self._prepare_increment(self._metric(record))
            self.send(s)
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            self.handleError(record)


logger.addHandler(StatsdHandler(os.environ[HOST_KEY], int(os.environ[PORT_KEY])))


def main():
    try:
        raise Exception("wow")
    except Exception as e:
        logger.error(e)


if __name__ == "__main__":
    main()

Adding lineno to the stat name will increase the cardinality a lot -- any edit to the source file might result in a new error. Therefore I wouldn't include lineno.