Lightstep fork of go-contrib instrumentation/host metrics

[jmacd]

Description: The go-contrib instrumentation/host package features several process-level metrics. These are candidates for inclusion in the runtime package and are candidates for the Golang runtime/metrics package to produce. Therefore, they are moved into a new package and this package retains only the system.* metrics.

Link to tracking Issue:
Part of #257. Part of #270.

Testing: New tests added.

Documentation: doc.go updated.

[jmacd]

Reviewers note: This is a fork which only removes code. The process.* metrics in this package are removed because they are potentially runtime metrics or can be produced with fewer dependencies. In practice, a user may not want this package of host metrics when the OTC hostmetrics receiver is available.

[codecov-commenter]

Codecov Report

Base: 94.14% // Head: 93.57% // Decreases project coverage by -0.56% ⚠️

Coverage data is based on head (825101e) compared to base (0883c13).
Patch coverage: 75.67% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
- Coverage   94.14%   93.57%   -0.57%     
==========================================
  Files          67       68       +1     
  Lines        3533     3644     +111     
==========================================
+ Hits         3326     3410      +84     
- Misses        158      174      +16     
- Partials       49       60      +11     

Impacted Files	Coverage Δ
lightstep/instrumentation/host/host.go	75.67% <75.67%> (ø)

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[mwear]

Do we expect to maintain this fork for the long term, or is it temporary until the upstream library can be updated?

[jmacd]

We would not maintain any of the instrumentation packages in otel-launcher-go if they are accepted upstream. The rate of upstream releases is very slow right now, so I'm avoiding. I will discuss this problem area in the Go SIG tomorrow.

[jmacd]

See open-telemetry/opentelemetry-go-contrib#2624 and open-telemetry/opentelemetry-go-contrib#2625