Stabilize Gauge (#1701) #4806

Job	Run time
cargo-deny	25s
coverage	3m 12s
docs	1m 28s
external-types (opentelemetry)	1m 0s
lint	3m 32s
external-types (opentelemetry-sdk)	1m 15s
external-types (opentelemetry-otlp)	1m 19s
msrv	3m 19s
external-types (opentelemetry-zipkin)	1m 15s
non-default-examples (opentelemetry-otlp/examples/basic-otlp)	37s
test (stable)	7m 57s
test (beta)	7m 29s
	32m 48s

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