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History

5.2.0 (October 14th, 2025)

Features

  • Added support for Python 3.14 (#181)

Backwards incompatible changes

  • Dropped support for Python 3.9 (#180)
  • Switch to uv and just for maintenance and development (#167)

5.1.0 (October 30th, 2024)

Features

  • Added support for Python 3.13 (#159)

Backwards incompatible changes

  • Dropped support for Python 3.8 (#160)

  • Changed timestamp field in LoggingMetrics. The LoggingMetrics now defaults to not emitting a timestamp at all. If you would like a timestamp, you can provide the "timestamp_mode" option with either "utc" for UTC timestamps or "local" for local timezone timestamps.

    No timestamp example:

    LoggingMetrics()

    emits lines like:

    METRICS|histogram|foo|4321|#key1:val

    "utc" timestamp mode example:

    LoggingMetrics(options={"timestamp_mode": "utc"})

    emits lines like:

    METRICS|2017-03-06T11:30:00+00:00:00|histogram|foo|4321|#key1:val

    "local" timestamp mode example:

    LoggingMetrics(options={"timestamp_mode": "local"})

    emits lines like:

    METRICS|2017-03-06T11:30:00|histogram|foo|4321|#key1:val

    If you want the original behavior, add set timestamp_mode to local. (#11)

5.0.0 (June 24th, 2024)

Features

  • Add support for Python 3.12 (#122)

  • Add AnyTagValue for asserting that metrics are emitted with certain tags, but ignoring the tag values in tests. (#141)

    Example:

    def test_somekey_emitted():
    with metricsmock() as mm:
        # emit some metrics

        mm.assert_incr("somekey", value=1, tags=[AnyTagValue("host")])

  • Add MetricsInterface.extend_prefix() to iteratively hone a metrics interface prefix. (#142)

    Example:

    metrics = markus.get_metrics("project")

module_metrics = metrics.extend_prefix("somemodule")

module_metrics.incr("key1")  # prefix is project.somemodule.key1

  • Add metricsmock pytest fixture. (#118)

  • Add RegisteredMetricsFilter metrics filter making it easier to enforce metrics can only be emitted if documented. (#15)

Backwards incompatible changes

  • Dropped support for Python 3.7 (#121)

4.2.0 (March 30th, 2023)

Bug fixes

  • Add support for setting origin_detection_enabled in Datadog backend. (#108)
  • Switch from Flake8 to Ruff. (#109)

4.1.0 (November 7th, 2022)

Features

  • Add support for Python 3.11 (#100)

Bug fixes

  • Redo how dev environment works so it's no longer installed via an extras but is now in a separate requirements-dev.txt file.
  • Split flake8 tou a separate requirements-flake8.txt and tox environment to handle conflicts with installing other things.

4.0.1 (May 10th, 2022)

Bug fixes

  • Move pytest import to a pytest plugin so it's easier to determine when pytest is running. (#95) Thank you, John!

4.0.0 (October 22nd, 2021)

Features

  • Added support for Python 3.10 (#88)

Backwards incompatibel changes

  • Dropped support for Python 3.6 (#89)

3.0.0 (February 5th, 2021)

Features

  • Added support for Python 3.9 (#79). Thank you, Brady!
  • Changed assert_* helper methods on markus.testing.MetricsMock to print the records to stdout if the assertion fails. This can save some time debugging failing tests. (#74)

Backwards incompatible changes

  • Dropped support for Python 3.5 (#78). Thank you, Brady!
  • markus.testing.MetricsMock.get_records and markus.testing.MetricsMock.filter_records return markus.main.MetricsRecord instances now. This might require you to rewrite/update tests that use the MetricsMock.

2.2.0 (April 15th, 2020)

Features

  • Add assert_ methods to MetricsMock to reduce the boilerplate for testing. Thank you, John! (#68)

Bug fixes

  • Remove use of six library. (#69)

2.1.0 (October 7th, 2019)

Features

  • Fix get_metrics() so you can call it without passing in a thing and it'll now create a MetricsInterface that doesn't have a key prefix. (#59)

2.0.0 (September 19th, 2019)

Features

  • Use time.perf_counter() if available. Thank you, Mike! (#34)
  • Support Python 3.7 officially.
  • Add filters for adjusting and dropping metrics getting emitted. See documentation for more details. (#40)

Backwards incompatible changes

  • tags now defaults to [] instead of None which may affect some expected test output.

  • Adjust internals to run .emit() on backends. If you wrote your own backend, you may need to adjust it.

  • Drop support for Python 3.4. (#39)

  • Drop support for Python 2.7.

    If you're still using Python 2.7, you'll need to pin to <2.0.0. (#42)

Bug fixes

  • Document feature support in backends. (#47)
  • Fix MetricsMock.has_record() example. Thank you, John!

1.2.0 (April 27th, 2018)

Features

  • Add .clear() to MetricsMock making it easier to build a pytest fixture with the MetricsMock context and manipulate records for easy testing. (#29)

Bug fixes

  • Update Cloudwatch backend fixing .timing() and .histogram() to send histogram metrics type which Datadog now supports. (#31)

1.1.2 (April 5th, 2018)

Typo fixes

  • Fix the date from the previous release. Ugh.

1.1.1 (April 5th, 2018)

Features

  • Official switch to semver.

Bug fixes

  • Fix MetricsMock so it continues to work even if configure is called. (#27)

1.1 (November 13th, 2017)

Features

  • Added markus.utils.generate_tag utility function

1.0 (October 30th, 2017)

Features

  • Added support for Python 2.7.
  • Added a markus.backends.statsd.StatsdMetrics backend that uses pystatsd client for statsd pings. Thank you, Javier!

Bug fixes

  • Added LoggingRollupMetrics to docs.
  • Mozilla has been running Markus in production for 6 months so we can mark it production-ready now.

0.2 (April 19th, 2017)

Features

  • Added a markus.backends.logging.LoggingRollupMetrics backend that rolls up metrics and does some light math on them. Possibly helpful for light profiling for development.

Bug fixes

  • Lots of documentation fixes. Thank you, Peter!

0.1 (April 10th, 2017)

Initial writing.