chore(deps): Update otel/metric to stable API

[ash2k]

Pick up https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.16.0.

The example also needs to be updated, but uptrace-go needs to be updated first.

Closes #2578.

[vmihailenco]

Thanks! uptrace-go update is blocked by open-telemetry/opentelemetry-go-contrib#3874

[pellared]

Are you not using uptrace-go only in OTel example?

Personally, I would suggest moving the example here: https://github.com/uptrace/uptrace-go/tree/master/example and change the existing example to use only the official "vanilla" OTel Go components.

PS. I am not a maintainer here. I just noticed this PR via open-telemetry/opentelemetry-go-contrib#3874 and I hope that this idea may help you. Feel free to ignore my comment for whatever reason 😉

[vmihailenco]

@ash2k uptrace-go is updated - could you update this PR?

Personally, I would suggest moving the example here

We had lots of examples in uptrace-go, but it was hard to update them and it resulted in a lot of noise in the repo for uptrace-go users.

Besides, the example here is in a separate module so it does not affect the redis client.

[ash2k]

@vmihailenco PTAL

[ash2k]

@vmihailenco Any plans to release a new version soon? :)

[vmihailenco]

@ash2k #2608