Add a new discovery bundle for weaviate vector search engine

[dloucasfx]

Description:
k8s integration test, if needed, will be in a different PR

Link to Splunk idea: <Link to Splunk idea, see https://ideas.splunk.com>

Testing:

Documentation:

[codecov]

Codecov Report

❌ Patch coverage is 27.27273% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.94%. Comparing base (1e72bbe) to head (b6292d2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/testutils/golden.go	42.85%	3 Missing and 1 partial ⚠️
tests/testutils/testcase.go	0.00%	4 Missing ⚠️

❌ Your patch status has failed because the patch coverage (27.27%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6884      +/-   ##
==========================================
- Coverage   37.95%   37.94%   -0.02%     
==========================================
  Files         367      367              
  Lines       25743    25751       +8     
==========================================
- Hits         9771     9770       -1     
- Misses      15161    15167       +6     
- Partials      811      814       +3     

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[Copilot]

Pull Request Overview

This PR adds Weaviate discovery support to the Splunk OpenTelemetry Collector, enabling automatic discovery and monitoring of Weaviate vector search engine instances.

Key changes:

• Added Weaviate receiver discovery configuration with Prometheus metrics scraping
• Added integration tests for Weaviate discovery via Docker observer
• Fixed null pointer issue in test utilities for cases where HEC endpoint is not configured

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/testutils/testcase.go	Added null check for HECEndpointForCollector to prevent panic when HEC is not configured
tests/testutils/golden.go	Added helper function to conditionally update expected metrics based on environment variable
tests/receivers/weaviate/weaviate_discovery_test.go	New integration test for Weaviate discovery using Docker observer
tests/receivers/weaviate/testdata/otlp_exporter.yaml	Test configuration file for OTLP exporter
tests/receivers/weaviate/testdata/expected.yaml	Expected metrics output for Weaviate discovery test
internal/receiver/discoveryreceiver/generated_metadata.go	Added Weaviate receiver metadata with status matching rules
internal/confmapprovider/discovery/generated_bundledfs.go	Registered Weaviate discovery bundle file
internal/confmapprovider/discovery/bundle.d/receivers/weaviate.discovery.yaml	Discovery configuration for Weaviate with metric filtering rules
docker/docker-compose.yml	Added Weaviate service container for integration testing
cmd/otelcol/config/collector/config.d.linux/receivers/weaviate.discovery.yaml	Generated reference configuration for Weaviate discovery
cmd/discoverybundler/metadata/receivers/weaviate.yaml	Source metadata file for Weaviate discovery configuration
Makefile	Added integration test target for Weaviate discovery
.github/workflows/integration-test.yml	Added Weaviate to CI integration test matrix
.chloggen/weaviate-discovery.yaml	Changelog entry for the enhancement

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[Copilot]

Pull Request Overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull Request Overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

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[Copilot]

Pull Request Overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

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[Copilot]

Inconsistent environment variable naming: this function uses UPDATE_EXPECTED_RESULTS while the existing similar function at line 166 uses UPDATE_EXPECTED. Consider using the same environment variable name for consistency across the codebase, or provide a clear comment explaining why different names are needed.

Suggested change

	return os.Getenv("UPDATE_EXPECTED_RESULTS") == "true"
	return os.Getenv("UPDATE_EXPECTED") == "true"

[Copilot]

[nitpick] The import go.opentelemetry.io/collector/pdata/pmetric should be grouped with other external imports (lines 29-32) rather than being separated by a blank line, as it's from the same opentelemetry ecosystem. This maintains consistency with Go's import grouping conventions.

[Copilot]

Pull Request Overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

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[Copilot]

The test uses pmetrictest.ChangeDatapointAttributeValue("goarch", func(string) string { return maskValue }) to change the goarch value to "xyz" during comparison. The expected.yaml should contain "xyz" instead of "arm64" to match the masked value used in the test.

Suggested change

	stringValue: arm64
	stringValue: xyz

[Copilot]

The test uses pmetrictest.ChangeDatapointAttributeValue("nodeID", func(string) string { return maskValue }) to change the nodeID value to "xyz" during comparison. The expected.yaml should contain "xyz" instead of "529a617433bd" to match the masked value used in the test.

Suggested change

	stringValue: 529a617433bd
	stringValue: xyz