Add markdown link check (#4287)

* Add markdown link check

* Fix links

* Now detects anchor links too!

* Reword comment

.github/scripts/markdown_link_check_config.json

@@ -0,0 +1,11 @@
+{
+  "ignorePatterns": [
+    {
+      "pattern": "^https://github\\.com/open-telemetry/opentelemetry-java/pull/"
+    },
+    {
+      "pattern": "^https://mvnrepository\\.com/artifact/"
+    }
+  ],
+  "retryOn429": true
+}

.github/workflows/main-build.yml

@@ -68,9 +68,37 @@ jobs:
           name: coverage-report
           path: all/build/reports/jacoco/test/html
 
+  markdown-link-check:
+    # release branches are excluded because links to external urls can break at any time which
+    # requires unnecessary release branch maintenance
+    if: ${{ !startsWith(github.ref_name, 'v') }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Check markdown links
+        # using retry because of sporadic external site failures
+        uses: nick-invision/retry@v2.6.0
+        with:
+          # timing out has not been a problem
+          timeout_minutes: 15
+          # give external site some time to hopefully recover
+          retry_wait_seconds: 120
+          max_attempts: 5
+          command: |
+            npm install -g markdown-link-check
+            find . -type f \
+                   -name '*.md' \
+                   -not -path './.github/*' \
+                   -not -path './node_modules/*' \
+                   -print0 \
+              | xargs -0 -n1 markdown-link-check --config .github/scripts/markdown_link_check_config.json
+
   publish-snapshots:
     name: Publish snapshots
     if: ${{ github.event_name == 'push' && github.repository == 'open-telemetry/opentelemetry-java' }}
+    # snapshot publishing is not dependent on markdown-link-check success, because links to external
+    # urls can break at any time
     needs: build
     runs-on: ubuntu-20.04
     steps:

CHANGELOG.md

@@ -745,8 +745,8 @@ in the `opentelemetry-sdk-extension-autoconfigure` module, where it is actually
 Note: In an effort to accelerate our work toward a 1.0.0 release, we have skipped the deprecation phase
 on a number of breaking changes. We apologize for the inconvenience this may have caused. We are very
 aware that these changes will impact users. If you need assistance in migrating from previous releases,
-please open a [discussion topic](https://github.com/opentelemetry/opentelemetry-java/discussions) at
-[https://github.com/opentelemetry/opentelemetry-java/discussions](https://github.com/opentelemetry/opentelemetry-java/discussions).
+please open a [discussion topic](https://github.com/open-telemetry/opentelemetry-java/discussions) at
+[https://github.com/open-telemetry/opentelemetry-java/discussions](https://github.com/open-telemetry/opentelemetry-java/discussions).
 
 Many classes have been made final that previously were not. Please reach out if you have a need to
 provide extended functionality, and we can figure out how best to solve your use-case.
@@ -813,8 +813,8 @@ the `http://` or `https://` in front of your endpoint.
 Note: In an effort to accelerate our work toward a 1.0.0 release, we have skipped the deprecation phase
 on a number of breaking changes. We apologize for the inconvenience this may have caused. We are very
 aware that these changes will impact users. If you need assistance in migrating from previous releases,
-please open a [discussion topic](https://github.com/opentelemetry/opentelemetry-java/discussions) at
-[https://github.com/opentelemetry/opentelemetry-java/discussions](https://github.com/opentelemetry/opentelemetry-java/discussions).
+please open a [discussion topic](https://github.com/open-telemetry/opentelemetry-java/discussions) at
+[https://github.com/open-telemetry/opentelemetry-java/discussions](https://github.com/open-telemetry/opentelemetry-java/discussions).
 
 #### Breaking Changes
 
@@ -1385,7 +1385,7 @@ See the `opentelemetry-extension-kotlin` module for details.
 - `DefaultSpan` was removed from the public API. Instead, use `Span.wrap(spanContext)` if you need a non-functional span that propagates the trace context.
 - `DefaultMeter`, `DefaultMeterProvider`, `DefaultTracer` and `DefaultTracerProvider` were removed from the public API. You can access the same functionality with `getDefault()` methods on the `Meter`, `MeterProvider, `Tracer`, and `TracerProvider` classes, respectively.
 - Some functionality from the `Tracer` interface is now available either on the `Span` interface or `Context` interface.
-- The `OpenTelemetry` class is now an interface, with implementations. Methods on this interface have changed their names to reflect this change. For more information, see [OpenTelemetry.java](/api/src/main/java/io/opentelemetry/api/OpenTelemetry.java).
+- The `OpenTelemetry` class is now an interface, with implementations. Methods on this interface have changed their names to reflect this change. For more information, see [OpenTelemetry.java](api/all/src/main/java/io/opentelemetry/api/OpenTelemetry.java).
 - All builder-creation methods have been renamed to `.builder()`.
 - `StatusCanonicalCode` has been renamed to `StatusCode`.
 - `Span.getContext()` has been renamed to `Span.getSpanContext()`.

CONTRIBUTING.md

@@ -163,16 +163,6 @@ of libraries with the old version number.
 To update it, you must fetch the tags, via `git fetch --all --tags` - which should work, even if you
 have forked the repo, as long as the trunk repo is set as an upstream remote.
 
-### Updating OTLP proto dependency version
-
-The OTLP proto dependency version is defined [here](proto/build.gradle). To bump the version,
-
-1. Find the latest release
-   version [here](https://github.com/open-telemetry/opentelemetry-proto/releases/latest)
-2. Download the zip source code archive
-3. Run `shasum -a 256 ~/path/to/downloaded.zip` to compute its checksum
-4. Update `protoVersion` and `protoChecksum` in the build file with the new version and checksum
-
 ### Composing builds
 
 Beware that this section is only meant for developers of opentelemetry-java, or closely related

exporters/zipkin/README.md

@@ -2,7 +2,7 @@
 
 [![Javadocs][javadoc-image]][javadoc-url]
 
-This is an OpenTelemetry exporter that sends span data using the [io.zipkin.reporter2:zipkin-reporter](https://github.com/openzipkin/zipkin-reporter-java") library.
+This is an OpenTelemetry exporter that sends span data using the [io.zipkin.reporter2:zipkin-reporter](https://github.com/openzipkin/zipkin-reporter-java) library.
 
 By default, this POSTs json in [Zipkin format](https://zipkin.io/zipkin-api/#/default/post_spans) to
 a specified HTTP URL. This could be to a [Zipkin](https://zipkin.io) service, or anything that

sdk-extensions/autoconfigure/README.md

@@ -12,7 +12,7 @@ environment variables, e.g., `OTEL_TRACES_EXPORTER=zipkin`.
 
 * [General notes](#general-notes)
 * [Exporters](#exporters)
-  + [OTLP exporter (both span and metric exporters)](#otlp-exporter-both-span-and-metric-exporters)
+  + [OTLP exporter (span, metric, and log exporters)](#otlp-exporter-span-metric-and-log-exporters)
   + [Jaeger exporter](#jaeger-exporter)
   + [Zipkin exporter](#zipkin-exporter)
   + [Prometheus exporter](#prometheus-exporter)
@@ -24,7 +24,7 @@ environment variables, e.g., `OTEL_TRACES_EXPORTER=zipkin`.
 * [Batch span processor](#batch-span-processor)
 * [Sampler](#sampler)
 * [Span limits](#span-limits)
-* [Interval metric reader](#interval-metric-reader)
+* [Periodic Metric Reader](#periodic-metric-reader)
 * [Customizing the OpenTelemetry SDK](#customizing-the-opentelemetry-sdk)
 
 ## General notes