• BREAKING CHANGE: Dropped support for Python 3.8 (#800)
• New lint: UNUSED_NO_LINT when a lint is listed for a metric but doesn't actually trigger
• New lint: UNKNOWN_LINT when an unknown lint is named in the no_lint list
• Add Sendable conformance to Pings (#810)
• BREAKING CHANGE: Add oneOf type to object metric type structure. This requires changes in the generated code and is thus breaking, but shouldn't affect users (#803)