Confusing name Metric.unbind

[legendecas]

@dyladan: An unbound metric can still be unbound again?
Originally posted at #1001 (comment)

Metric.unbind invalidate a previously bound instrument. While the bound instruments can still outlive and recording new values, Metric.unbind merely makes the value of the unbound instruments not been exported.

Another point is that metrics created are not bound by default, i.e. no label values set, and we have two ways to record new values, here counterMetric created by meter.createCounter('foo') is taken for example:

1. counterMetric.add(value: number, labels: api.Labels)
2. counterMetric.bind(labels: api.Labels): BoundCounter then boundCounter.add(value: number)

So basically counterMetric itself in the example is not bound but can be unbound by definition.

AFAICT, Metric.unbind is not documented in spec here https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/metrics/api-user.md.

[legendecas]

Closing as the issue is no longer applicable.