Release History: opentelemetry-metrics-api

v0.4.0 / 2025-08-14

• ADDED: Support asynchronous instruments: ObservableGauge, ObservableCounter and ObservableUpDownCounter

• FIXED: Update max instrument name length from 63 to 255 characters and allow / in instrument names

v0.3.0 / 2025-02-25

• ADDED: Support 3.1 Min Version

v0.2.0 / 2025-01-08

• ADDED: Add synchronous gauge

• DOCS: Add documentation for Metrics API instruments

v0.1.1 / 2024-10-22

• FIXED: Refactor instrument validation

v0.1.0 / 2024-07-31

Initial release.