• Add the module_spec option to the javascript_server outputter (#726)


  • New Metric Types: labeled_{custom|memory|timing}_distribution (bug 1657947)


  • Fix Kotlin/Swift code generation for object metrics, now generating top-level typealiases where needed (#722)


  • ping schedule: Gracefully handle missing ping (#705)


  • Replace deprecated methods and package (#699)


  • Add Go log outputter support for datetime (go_server) (#693)


  • BUGFIX: Fix missing ping_arg in (#687)


  • BREAKING CHANGE: Expose the optional enabled property on pings, defaulting to enabled: true (#681)

  • BREAKING CHANGE: Support metadata field ping_schedule for pings (bug 1804711)

  • Add support for event metric type in server JavaScript outputter (DENG-2407)

  • Add Swift and Kotlin codegen support for the object metric type object (#685)


  • Use faster C yaml parser if available (#677)


  • BREAKING CHANGE: Support metadata field include_info_sections (bug 1866559)


  • Fix Rust codegen for object metric type (#662)


  • Add new metric type object (only Rust codegen support right now) (#587)


  • Add Go log outputter (go_server) (#645)

  • Add Python log outputter (python_server) (MPP-3642)


  • Fix javascript_server template to include non-event metric parameters in #record call for event metrics (#643)

  • events: Increase extra key limit to 50 (Bug 1869429)


  • Add updated logging logic for Ruby Server (#642)

  • Add support for event metric type in server-side JavaScript outputter (DENG-1736)

  • BREAKING CHANGE: Dropped support for Python 3.7 (#638)

  • Add official support for Python 3.11+ (#638)


  • Warn about empty or TODO-tagged data reviews in the list (#634)

  • Allow unit field on all metrics, but warn for all but quantity and custom distribution (#636)


  • Allow unit field for string again, but warn about it in the linter (#634)


  • Allow unit field for custom distribution again (#633)


  • Add Ruby log outputter (ruby_server) (#620)

  • BREAKING CHANE: ping lifetime metrics on the events ping are now disallowed (#625)

  • Disallow unit field for anything but quantity (#630). Note that this was already considered the case, now the code enforces it.


  • BREAKING CHANGE: Dropped support for Python 3.6 (#615)

  • Allow metadata to configure precise timestamps in pings (#592)


  • Small updates to the javascript_server tempalte to address lint warnings (#598)


  • Increased the maximum metric name length in version 2.0.0 schema (#596)


  • BREAKING CHANGE: Remove exposed lint_yaml_files function (#580)

  • Rust: Removed __glean_metric_maps from the Rust Jinja template. This functionality is better placed downstream (Bug 1816526)

  • New lint: check that all referenced pings are known (#584)

  • Add experimental server-side JavaScript outputter (FXA-7922)


  • Unbreak last minor release (#579)


  • Remove yamllint integration (#578)


  • ENHANCEMENT: Labels in labels: fields may now contain any printable ASCII characters (bug 1672273)

  • BUGFIX: Enforce ordering of generation of Pings, Metrics and Tags such that order is deterministic (bug 1820334)


  • BUGFIX: Remove internal-only fields from serialized metrics data (#550)

  • FEATURE: New subcommand: dump to dump the metrics data as JSON (#550)

  • BUGFIX: Kotlin: Generate enums with the right generic bound for ping reason codes (#551).

  • BREAKING CHANGE: Fully remove support for the old events API (#549) Adds a new lint OLD_EVENT_API to warn about missing type attributes on event extra keys. Note that the Glean SDK already dropped support for the old events API.


  • BUGFIX: Correct code generation for labeled metrics in Rust (#533)

  • BUGFIX: Correctly serialize Rates for Rust code (#530)

  • Feature: Wrap labeled metric’s static labels list as CoW strings (requires updated Glean support) (#534)



  • Add support for Rate, Denominator and Numerator metrics for JavaScript. (bug 1793777)


  • [data-review] Use a template to generate the Data Review Request template (bug 1772605)

  • Make tag and no_lint order deterministic (#518)


  • Swift: Add a conditional import Foundation to support generating metrics when Glean is delivered via the AppServices iOS megazord


  • Rust: Use correct name for a ping in generated code.


  • [data-review] Include extra keys’ names and descriptions in data review template (bug 1767027)

  • Raise limit on number of statically-defined labels to 4096. (bug 1772163)

  • Fix Rust code generation for new UniFFI interface (#491, #494, #495)


  • Relax version requirement for MarkupSafe. Now works with MarkupSafe v1.1.1 to v2.0.1 inclusive again.


  • BUGFIX: Add missing extra_args to Rust constructor generation (bug 1765855)

  • Breaking change: glean_parser now generates metrics compatible with the UniFFI-powered Glean SDK. This is not backwards-compatible with previous versions.

  • Generate Rate, Denominator and Numerator metrics for Kotlin and Swift

  • Explicitly skip Rate, Denominator and Numerator metrics for JavaScript. These will cause a build failure by default, but can be turned into warnings on request. Use -s fail_rates=false to enable warning-only mode.


  • BUGFIX: Revert changes made on v5.1.1.

    • The issues addressed by those changes, were non-issues and result of misuse of the APIs.


  • BUGFIX: Fix issues with Swift templates (bug 1749494)

    • Make metrics and pings all public

    • Make pings static


  • Add support for build info generation for JavaScript and Typescript targets (bug 1749494)


  • Fix the logic for the metric expiration by version (bug 1753194)


  • Remove C# support (#436).

  • Add support for Rust code generation (bug 1677434)

  • Report an error if no files are passed (bug 1751730)

  • [data-review] Report an error if no metrics match provided bug number (bug 1752576)

  • [data-review] Include notification_emails in list of those responsible (bug 1752576)

  • Add support for expiring metrics by the provided major version (bug 1753194)


  • Support global file-level tags in metrics.yaml (bug 1745283)

  • Glinter: Reject metric files if they use unit by mistake. It should be time_unit (#432).

  • Automatically generate a build date when generating build info (#431). Enabled for Kotlin and Swift. This can be changed with the build_date command line option. build_date=0 will use a static unix epoch time. build_date=2022-01-03T17:30:00 will parse the ISO8601 string to use (as a UTC timestamp). Other values will throw an error.


    glean_parser translate –format kotlin –option build_date=2021-11-01T01:00:00 path/to/metrics.yaml


  • BUGFIX: Skip tags for code generation (#409)



  • Improve the schema validation error messages. They will no longer include OrderedDict(...) on Python 3.7 and later (bug 1733395)

  • Officially support Python 3.10

4.1.1 (2021-09-28)

  • Update private import paths on Javascript / Typescript templates. (bug 1702468)

4.1.0 (2021-09-16)

  • Add support for Node.js platform on Javascript / Typescript templates. (bug 1728982)

4.0.0 (2021-08-20)

  • Add support for Text metric type (#374)

  • Reserve the default ping name. It can’t be used as a ping name, but it can be used in send_in_pings (#376)

3.8.0 (2021-08-18)

  • Expose ping reasons enum on JavaScript / TypeScript templates. (bug 1719136)

  • Define an interface with the allowed extras for each event on the TypeScript template. (bug 1693487)

3.7.0 (2021-07-13)

  • New lint: Check for redundant words in ping names (#355)

  • Add support for URL metric type (#361)

3.6.0 (2021-06-11)

  • Add a command data-review to generate a skeleton Data Review Request for all metrics matching a supplied bug number. (bug 1704541)

  • Enable custom distribution outside of GeckoView (gecko_datapoint becomes optional)

3.5.0 (2021-06-03)

  • Transform generated folder into QML Module when building Javascript templates for the Qt platform. (bug 1707896

    • Import the Glean QML module from inside each generated file, removing the requirement to import Glean before importing any of the generated files;

    • Prodive a qmldir file exposing all generated files;

    • Drop the namespace option for Javascript templates;

    • Add a new version option for Javascript templates, required when building for Qt, which expected the Glean QML module version.

3.4.0 (2021-05-28)

  • Add missing import for Kotlin code (#339)

  • Use a plain Kotlin type in the generated interface implementation (#339)

  • Generate additional generics for event metrics (#339)

  • For Kotlin skip generating GleanBuildInfo.kt when requested (with with_buildinfo=false) (#341)

3.3.2 (2021-05-18)

  • Fix another bug in the Swift code generation when generating extra keys (#334)

3.3.1 (2021-05-18)

  • Fix Swift code generation bug for pings (#333)

3.3.0 (2021-05-18)

  • Generate new event API construct (#321)

3.2.0 (2021-04-28)

  • Add option to add extra introductory text to generated markdown (#298)

  • Add support for Qt in Javascript templates (bug 1706252)

    • Javascript templates will now accept the platform option. If this option is set to qt the generated templates will be Qt compatible. Default value is webext.

3.1.2 (2021-04-21)

  • BUGFIX: Remove the “DO NOT COMMIT” notice from the documentation.

3.1.1 (2021-04-19)

  • Recommend to not commit as well as to not edit the generated files. (bug 1706042)

  • BUGFIX: Include import statement for labeled metric subtypes in Javascript and Typescript templates.

3.1.0 (2021-04-16)

  • Add support for labeled metric types in Javascript and Typescript templates.

3.0.0 (2021-04-13)

  • Raise limit on number of statically-defined lables to 100. (bug 1702263)

  • BUGFIX: Version 2.0.0 of the schema now allows the “special” glean_.* ping names for Glean-internal use again.

  • Remove support for JWE metric types.

2.5.0 (2021-02-23)

  • Add parser and object model support for rate metric type. (bug 1645166)

  • Add parser and object model support for telemetry_mirror property. (bug 1685406)

  • Update the Javascript template to match Glean.js expectations. (bug 1693516)

    • Glean.js has updated it’s export strategy. It will now export each metric type as an independent module;

    • Glean.js has dropped support for non ES6 modules.

  • Add support for generating Typescript code. (bug 1692157)

    • The templates added generate metrics and pings code for Glean.js.

2.4.0 (2021-02-18)

  • Experimental: glean_parser has a new subcommand coverage to convert raw coverage reports into something consumable by coverage tools, such as

  • The path to the file that each metric is defined in is now stored on the Metric object in defined_in["filepath"].

2.3.0 (2021-02-17)

  • Leverage the glean_namespace to provide correct import when building for Javascript.

2.2.0 (2021-02-11)

  • The Kotlin generator now generates static build information that can be passed into Glean.initialize to avoid calling the package manager at runtime.

2.1.0 (2021-02-10)

  • Add support for generating Javascript code.

    • The templates added generate metrics and pings code for Glean.js.

2.0.0 (2021-02-05)

  • New versions 2.0.0 of the metrics.yaml and pings.yaml schemas now ship with glean_parser. These schemas are different from version 1.0.0 in the following ways:

    • Bugs must be specified as URLs. Bug numbers are disallowed.

    • The legacy ping names containing underscores are no longer allowed. These included deletion_request, bookmarks_sync, history_sync, session_end, all_pings, glean_*). In these cases, the _ should be replaced with -.

    To upgrade your app or library to use the new schema, replace the version in the $schema value with 2-0-0.

  • Breaking change: It is now an error to use bug numbers (rather than URLs) in ping definitions.

  • Add the line number that metrics and pings were originally defined in the yaml files.

1.29.1 (2020-12-17)

  • BUGFIX: Linter output can now be redirected correctly (1675771).

1.29.0 (2020-10-07)

  • Breaking change: glean_parser will now return an error code when any of the input files do not exist (unless the --allow-missing-files flag is passed).

  • Generated code now includes a comment next to each metric containing the name of the metric in its original snake_case form.

  • When metrics don’t provide a unit parameter, it is not included in the output (as provided by probe-scraper).

1.28.6 (2020-09-24)

  • BUGFIX: Ensure Kotlin arguments are deterministically ordered

1.28.5 (2020-09-14)

  • Fix deploy step to update pip before deploying to pypi.

1.28.4 (2020-09-14)

  • The SUPERFLUOUS_NO_LINT warning has been removed from the glinter. It likely did more harm than good, and makes it hard to make metrics.yaml files that pass across different versions of glean_parser.

  • Expired metrics will now produce a linter warning, EXPIRED_METRIC.

  • Expiry dates that are more than 730 days (~2 years) in the future will produce a linter warning, EXPIRATION_DATE_TOO_FAR.

  • Allow using the Quantity metric type outside of Gecko.

  • New parser configs custom_is_expired and custom_validate_expires added. These are both functions that take the expires value of the metric and return a bool. (See Metric.is_expired and Metric.validate_expires). These will allow FOG to provide custom validation for its version-based expires values.

1.28.3 (2020-07-28)

  • BUGFIX: Support HashSet and Dictionary in the C## generated code.

1.28.2 (2020-07-28)

  • BUGFIX: Generate valid C## code when using Labeled metric types.

1.28.1 (2020-07-24)

  • BUGFIX: Add missing column to correctly render markdown tables in generated documentation.

1.28.0 (2020-07-23)

  • Breaking change: The internal ping deletion-request was misnamed in causing the linter to not allow use of the correctly named ping for adding legacy ids to. Consuming apps will need to update their metrics.yaml if they are using deletion_request in any send_in_pings to deletion-request after updating.

1.27.0 (2020-07-21)

  • Rename the data_category field to data_sensitivity to be clearer.

1.26.0 (2020-07-21)

  • Add support for JWE metric types.

  • Add a data_sensitivity field to all metrics for specifying the type of data collected in the field.

1.25.0 (2020-07-17)

  • Add support for generating C## code.

  • BUGFIX: The memory unit is now correctly passed to the MemoryDistribution metric type in Swift.

1.24.0 (2020-06-30)

  • BUGFIX: look for metrics in send_if_empty pings. Metrics for these kinds of pings were being ignored.

1.23.0 (2020-06-27)

  • Support for Python 3.5 has been dropped.

  • BUGFIX: The ordering of event extra keys will now match with their enum, fixing a serious bug where keys of extras may not match the correct values in the data payload. See

1.22.0 (2020-05-28)

  • Breaking change: (Swift only) Combine all metrics and pings into a single generated file Metrics.swift.

1.21.0 (2020-05-25)

  • glinter messages have been improved with more details and to be more actionable.

  • A maximum of 10 extra_keys is now enforced for event metric types.

  • BUGFIX: the Lifetime enum values now match the values of the implementation in mozilla/glean.

1.20.4 (2020-05-07)

  • BUGFIX: yamllint errors are now reported using the correct file name.

1.20.3 (2020-05-06)

  • Support for using timing_distribution’s time_unit parameter to control the range of acceptable values is documented. The default unit for this use case is nanosecond to avoid creating a breaking change. See bug 1630997 for more information.

1.20.2 (2020-04-24)

  • Dependencies that depend on the version of Python being used are now specified using the Declaring platform specific dependencies syntax in setuptools. This means that more recent versions of dependencies are likely to be installed on Python 3.6 and later, and unnecessary backport libraries won’t be installed on more recent Python versions.

1.20.1 (2020-04-21)

  • The minimum version of the runtime dependencies has been lowered to increase compatibility with other tools. These minimum versions are now tested in CI, in addition to testing the latest versions of the dependencies that was already happening in CI.

1.20.0 (2020-04-15)

  • Breaking change: glinter errors found during the translate command will now return an error code. glinter warnings will be displayed, but not return an error code.

  • glean_parser now produces a linter warning when user lifetime metrics are set to expire. See bug 1604854 for additional context.

1.19.0 (2020-03-18)

  • Breaking change: The regular expression used to validate labels is stricter and more correct.

  • Add more information about pings to markdown documentation:

    • State whether the ping includes client id;

    • Add list of data review links;

    • Add list of related bugs links.

  • glean_parser now makes it easier to write external translation functions for different language targets.

  • BUGFIX: glean_parser now works on 32-bit Windows.

1.18.3 (2020-02-24)

  • Dropped the inflection dependency.

  • Constrained the zipp and MarkupSafe transitive dependencies to versions that support Python 3.5.

1.18.2 (2020-02-14)

  • BUGFIX: Fix rendering of first element of reason list.

1.18.1 (2020-02-14)

  • BUGFIX: Reason codes are displayed in markdown output for built-in pings as well.

  • BUGFIX: Reason descriptions are indented correctly in markdown output.

  • BUGFIX: To avoid a compiler error, the @JvmName annotation isn’t added to private members.

1.18.0 (2020-02-13)

  • Breaking Change (Java API) Have the metrics names in Java match the names in Kotlin. See Bug 1588060.

  • The reasons a ping are sent are now included in the generated markdown documentation.

1.17.3 (2020-02-05)

  • BUGFIX: The version of Jinja2 now specifies < 3.0, since that version no longer supports Python 3.5.

1.17.2 (2020-02-05)

  • BUGFIX: Fixes an import error in generated Kotlin code.

1.17.1 (2020-02-05)

  • BUGFIX: Generated Swift code now includes import Glean, unless generating for a Glean-internal build.

1.17.0 (2020-02-03)

  • Remove default schema URL from validate_ping

  • Make schema argument required for CLI

  • BUGFIX: Avoid default import in Swift code for Glean itself

  • BUGFIX: Restore order of fields in generated Swift code

1.16.0 (2020-01-15)

  • Support for reason codes on pings was added.

1.15.6 (2020-02-06)

  • BUGFIX: The version of Jinja2 now specifies < 3.0, since that version no longer supports Python 3.5 (backported from 1.17.3).

1.15.5 (2019-12-19)

  • BUGFIX: Also allow the legacy name all_pings for send_in_pings parameter on metrics

1.15.4 (2019-12-19)

  • BUGFIX: Also allow the legacy name all_pings

1.15.3 (2019-12-13)

  • Add project title to markdown template.

  • Remove “Sorry about that” from markdown template.

  • BUGFIX: Replace dashes in variable names to force proper naming

1.15.2 (2019-12-12)

  • BUGFIX: Use a pure Python library for iso8601 so there is no compilation required.

1.15.1 (2019-12-12)

  • BUGFIX: Add some additional ping names to the non-kebab-case allow list.

1.15.0 (2019-12-12)

  • Restrict new pings names to be kebab-case and change all_pings to all-pings

1.14.0 (2019-12-06)

  • glean_parser now supports Python versions 3.5, 3.6, 3.7 and 3.8.

1.13.0 (2019-12-04)

  • The translate command will no longer clear extra files in the output directory.

  • BUGFIX: Ensure all newlines in comments are prefixed with comment markers

  • BUGFIX: Escape Swift keywords in variable names in generated code

  • Generate documentation for pings that are sent if empty

1.12.0 (2019-11-27)

  • Reserve the deletion_request ping name

  • Added a new flag send_if_empty for pings

1.11.0 (2019-11-13)

  • The glinter command now performs yamllint validation on registry files.

1.10.0 (2019-11-11)

  • The Kotlin linter detekt is now run during CI, and for local testing if installed.

  • Python 3.8 is now tested in CI (in addition to Python 3.7). Using tox for this doesn’t work in modern versions of CircleCI, so the tox configuration has been removed.

  • yamllint has been added to test the YAML files on CI.

  • ⚠ Metric types that don’t yet have implementations in glean-core have been removed. This includes enumeration, rate, usage, and use_counter, as well as many labeled metrics that don’t exist.

1.9.5 (2019-10-22)

  • Allow a Swift lint for generated code

  • New lint: Restrict what metric can go into the baseline ping

  • New lint: Warn for slight misspellings in ping names

  • BUGFIX: change Labeled types labels from lists to sets.

1.9.4 (2019-10-16)

  • Use lists instead of sets in Labeled types labels to ensure that the order of the labels passed to the metrics.yaml is kept.

  • glinter will now check for duplicate labels and error if there are any.

1.9.3 (2019-10-09)

  • Add labels from Labeled types to the Extra column in the Markdown template.

1.9.2 (2019-10-08)

  • BUGFIX: Don’t call is_internal_metric on Ping objects.

1.9.1 (2019-10-07)

  • Don’t include Glean internal metrics in the generated markdown.

1.9.0 (2019-10-04)

  • Glinter now warns when bug numbers (rather than URLs) are used.

  • BUGFIX: add HistogramType and MemoryUnit imports in Kotlin generated code.

1.8.4 (2019-10-02)

  • Removed unsupported labeled metric types.

1.8.3 (2019-10-02)

  • Fix indentation for generated Swift code

1.8.2 (2019-10-01)

  • Created labeled metrics and events in Swift code and wrap it in a configured namespace

1.8.1 (2019-09-27)

  • BUGFIX: memory_unit is now passed to the Kotlin generator.

1.8.0 (2019-09-26)

  • A new parser config, do_not_disable_expired, was added to turn off the feature that expired metrics are automatically disabled. This is useful if you want to retain the disabled value that is explicitly in the metrics.yaml file.

  • glinter will now report about superfluous no_lint entries.

1.7.0 (2019-09-24)

  • A glinter tool is now included to find common mistakes in metric naming and setup. This check is run during translate and warnings will be displayed. ⚠ These warnings will be treated as errors in a future revision.

1.6.1 (2019-09-17)

  • BUGFIX: GleanGeckoMetricsMapping must include LabeledMetricType and CounterMetricType.

1.6.0 (2019-09-17)

  • NEW: Support for outputting metrics in Swift.

  • BUGFIX: Provides a helpful error message when geckoview_datapoint is used on an metric type that doesn’t support GeckoView exfiltration.

  • Generate a lookup table for Gecko categorical histograms in GleanGeckoMetricsMapping.

  • Introduce a ‘Swift’ output generator.

1.4.1 (2019-08-28)

  • Documentation only.

1.4.0 (2019-08-27)

  • Added support for generating markdown documentation from metrics.yaml files.

1.3.0 (2019-08-22)

  • quantity metric type has been added.

1.2.1 (2019-08-13)

  • BUGFIX: includeClientId was not being output for PingType.

1.2.0 (2019-08-13)

  • memory_distribution metric type has been added.

  • custom_distribution metric type has been added.

  • labeled_timespan is no longer an allowed metric type.

1.1.0 (2019-08-05)

  • Add a special all_pings value to send_in_pings.

1.0.0 (2019-07-29)

  • First release to start following strict semver.

0.1.0 (2018-10-15)

  • First release on PyPI.