• Swift: Fix argument labels in labeled *distributions (#859)

• BREAKING CHANGE: Generate labeled {custom|memory|timing} distribution for mobile (#857)
• Allow categories to have subcategories longer than 29 characters (bug 2062403)

What's Changed

• update Metric.serialize to allow renaming of fields by @jeddai in #856

New Contributors

• @jeddai made her first contribution in #856

Full Changelog: v20.1.0...v20.2.0

• Allow to overwrite date to check expiry against using the SOURCE_DATE_EPOCH environment variable (bug 2052175)
• Disable the COMMON_PREFIX lint. (bug 2052480)
  This is not a breaking change: We keep the name, but the lint will never trigger.

• Ensure in_session is present for all metrics in the object model, like the other CommonMetricData args (bug 2046193).

20.0.0

• BREAKING CHANGE: Go server: replaced the go_server_pubsub outputter with a transport option on go_server (-s transport=logging|pubsub|combined, default logging); combined emits both transports in one file and ping params gain an optional DocumentID to share a document_id across them for gradual migration (#849)
• Add support for Glean session implementation (#840)

• Go server template: add go_server_pubsub outputter to support direct
  Pub/Sub delivery (DENG-9533)

• Use JSON serialization for on-disk caching

• Go server: Add support for labeled_boolean metrics with static labels (AE-1250)
• BUGFIX: Go server: Serialize nil string_list metrics as empty arrays instead of null (#837)
• Add support to target glean_sym (the new experimental Glean Rust API) (#841)

• Python server: Support optional metrics (#828)
• BUGFIX: Correct event timestamp values in server language templates (#831)
• Remove the coverage subcommand. The SDK also removed metric testing covergae (#832)