Marc Pichler

### Is your feature request related to a problem? The Prometheus example in `experimental/examples/prometheus` is a bit outdated at the moment, with `@opentelemetry/sdk-metrics-base` at `0.28.0`. Further #3162 renames `@opentelemetry/sdk-metrics-base` to...

Review all metrics packages and remove unwanted exports

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With the GA release of metrics coming up, we should review all exports of the metrics packages, and make sure that we do not export anything we do not want...

Rename `InstrumentationLibrary` -> `InstrumentationScope`

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`InstrumentationLibrary` has been renamed `InstrumentationScope` in the spec. We need to find a non-breaking solution to rename it (and associated fields) in the Trace SDK as it already had a...

## Describe your problem This might not be a bug, but not consistent with the specification. :slightly_smiling_face: Creating a named `View` with only `instrument_type` does not raise an Error, even...

fix(exporters): do not append trailing '/' when URL contains path

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## Which problem is this PR solving? When a signal specific environment variable (`OTEL_EXPORTER_OTLP__ENDPOINT`) was passed with a url that contains a path not ending in `v1/traces` or `v1/metrics`, a...

docs(metrics-exporters): fix wrong exporter const name in example

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## Which problem is this PR solving? The exporter `const` was named `exporter` and used incorrectly as `metricExporter` in the Exporter's `README.md`s. This PR fixes that by changing the name...

TracerProvider should return no-op tracer when shutdown

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## Description According to the spec a TracerProvider should return no-op tracer when shutdown. ## Steps to Reproduce Test for `BasicTracerProvider.test.ts` ```ts describe('.getTracer()', () => { it('should return no-op tracer...

OTLP exporters should set User-Agent header as per specification

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### Is your feature request related to a problem? Please describe. Currently the `User-Agent` header is not set by our exporters [as defined in the specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#user-agent). ### Describe the solution...

docs(sdk-metrics): fix badge and reword introductory sentence

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## Which problem is this PR solving? The badge still showed the version of the outdated "@opentelemetry/metrics" package. The introductory sentence mentioned other Metrics SDKs (node + browser) that were...

`satisfies()` using `1.*`-style wildcard evaluates to `false` for all non `0` patch versions

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Hi, thanks for your work on this package! :slightly_smiling_face: While troubleshooting, I came across some unexpected results. It looks like using a non-zero patch version will always evaluate to `false`...