Migrate to OTEL-Go v1.14.0

[kilianstallz]

OpenTelemetry-Go did change the sigature for the metric.Reader interface.
They also deprecated the Unit interface in favor of a string.

To keep using otelfiber with the latest otel-go packages we need to replace the Unit struct with string constants.
I also adapted the call signature of the reader interface like it is shown in the libraries tests.

metrics := metricdata.ResourceMetrics{}
err := reader.Collect(context.Background(), &metrics)

[ReneWerner87]

does this mean that it is a breaking change and we should upgrade the major version of the package ?

[kilianstallz]

does this mean that it is a breaking change and we should upgrade the major version of the package ?

Depends on how you would consider it.
The usage of Otelfiber would not change, as the Middleware API did not change.
However, the otel-go package did introduce breaking changes to the reader interface.

So I would say it isn't a breaking change to this package. But users need to use otel-go 1.14.0.

You can read the changelog of this release, v1.14.0

Sorry, I should have written a more detailed description to this PR.

[kilianstallz]

The specific breaking changes from the Otel-go package (v1.14.0) that I adapted are:

• Change to the reader interface
• The Unit-Interface has been deprecated and has now been removed

The otelfiber.Middleware interface did not change.

[ReneWerner87]

The usage of Otelfiber would not change, as the Middleware API did not change.

this is enough to know 👍

[eko]

Hi, do we expect anything else on this PR?