Release v1.22.0

Release v1.22.0 (2023-06-09)

Context

• No changes.

Traces

• No changes.

Metrics

• Make recommendation to reserve aggregator normative.
  (#3526)

Logs

• No changes.

Resource

• No changes.

Compatibility

• No changes.

OpenTelemetry Protocol

• Move OTLP specification to github.com/open-telemetry/opentelemetry-proto.
  (#3454)

SDK Configuration

• Extract Examplar section and mark it as Experimental.
  (#3533)

Telemetry Schemas

• No changes.

Common

• Explain why custom attributes are not recommended to be placed in OTel
  namespaces.
  (#3507)

Supplementary Guidelines

• No changes.

New Contributors

• @zeitlinger made their first contribution in #3542