release: Release 9 gems

[github-actions]

This pull request prepares new gem releases for the following gems:

• opentelemetry-api 0.12.2 (was 0.12.1)
• opentelemetry-sdk 0.13.0 (was 0.12.1)
• opentelemetry-common 0.13.0 (was 0.12.0)
• opentelemetry-exporter-jaeger 0.13.0 (was 0.12.0)
• opentelemetry-exporter-otlp 0.13.0 (was 0.12.1)
• opentelemetry-instrumentation-mongo 0.12.1 (was 0.12.0)
• opentelemetry-instrumentation-rack 0.12.1 (was 0.12.0)
• opentelemetry-instrumentation-ruby_kafka 0.12.1 (was 0.12.0)
• opentelemetry-instrumentation-sidekiq 0.13.0 (was 0.12.0)

For each gem, this pull request modifies the gem version and provides an initial changelog entry based on conventional commit messages. You can edit these changes before merging, to release a different version or to alter the changelog text.

• To confirm this release, merge this pull request, ensuring the "release: pending" label is set. The release script will trigger automatically on merge.
• To abort this release, close this pull request without merging.

The generated changelog entries have been copied below:

---

opentelemetry-api

v0.12.2 / 2021-01-29

• FIXED: Small test fixes.

---

opentelemetry-sdk

v0.13.0 / 2021-01-29

• BREAKING CHANGE: Remove MILLIS from BatchSpanProcessor vars

• ADDED: Process.runtime resource

• ADDED: Provide default resource in SDK

• FIXED: Resource.merge consistency

• FIXED: Remove MILLIS from BatchSpanProcessor vars

---

opentelemetry-common

v0.13.0 / 2021-01-29

• ADDED: Add untraced wrapper to common utils

---

opentelemetry-exporter-jaeger

v0.13.0 / 2021-01-29

• ADDED: Provide default resource in SDK
• ADDED: Add untraced wrapper to common utils

---

opentelemetry-exporter-otlp

v0.13.0 / 2021-01-29

• BREAKING CHANGE: Spec compliance for OTLP exporter

• ADDED: Add untraced wrapper to common utils

• FIXED: Spec compliance for OTLP exporter

• FIXED: Conditionally append path to collector endpoint

• FIXED: OTLP path should be /v1/traces

---

opentelemetry-instrumentation-mongo

v0.12.1 / 2021-01-29

• FIXED: Mongo Instrumenter: Do not send nil attributes

---

opentelemetry-instrumentation-rack

v0.12.1 / 2021-01-29

• FIXED: Only include user agent when present

---

opentelemetry-instrumentation-ruby_kafka

v0.12.1 / 2021-01-29

• FIXED: Add minimum gem version for ruby-kafka
• FIXED: Ruby_kafka baggage propagation
• FIXED: Remove unused ruby-kafka events file

---

opentelemetry-instrumentation-sidekiq

v0.13.0 / 2021-01-29

• ADDED: Instrument sidekiq background work
• FIXED: Adjust Sidekiq middlewares to match semantic conventions
• FIXED: Set minimum compatible version and use untraced helper

[fbogsany]

I was about to rant about the divergence in SDK and API version numbers, but I re-read the versioning and stability doc and this is explicitly allowed.

[robertlaurin]

I added three commits to the PR to bump the dependency on common. My reason being is in this PR #580 I moved the untraced method into common.

If someone were to pull the latest version of say the OTLP exporter but not common, then the gem would run into errors as untraced would not be defined. I think my changes make sense,.

However now I'm running into issues with testing an unrelated gem (see snippet below)

Testing opentelemetry-instrumentation-active_model_serializers ...
Fetching gem metadata from https://rubygems.org/.........
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Bundler could not find compatible versions for gem "opentelemetry-common":
  In Gemfile:
    opentelemetry-common

    opentelemetry-sdk was resolved to 0.13.0, which depends on
      opentelemetry-common (~> 0.12.0)
Error: Process completed with exit code 6.

So my confusion here comes from the fact that my changes did not introduce this dependency issue but instead the Action that triggered this PR didn't actually run CI for itself.

[github-actions]

WARNING: An additional commit was added while this release PR was open.
You may need to add to the changelog, or close this PR and prepare a new one.

Commit link: ccde158

Message:
fix: Jaeger ref type should be FOLLOWS_FROM (#585)

[github-actions]

WARNING: An additional commit was added while this release PR was open.
You may need to add to the changelog, or close this PR and prepare a new one.

Commit link: ae4d310

Message:
fix: rename OTLP env vars SPAN -> TRACES (#584)

[fbogsany]

Closing this - I'll cut a new release with a few additional small PRs

[github-actions]

Release PR closed without merging.