Implement group inspection to display deletion details

[ButterBright]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Related to [Feature] Delete entire group skywalking#13407.
• Update the CHANGES log.

[Copilot]

Pull request overview

This pull request implements group inspection functionality to display detailed information about groups including schema info, data statistics, and liaison node status. The implementation supports both standalone and distributed modes.

Changes:

• Added comprehensive integration tests for inspect functionality in standalone and distributed modes
• Implemented data collection infrastructure across trace, stream, and measure services
• Added new gRPC Inspect endpoint to the group registry service
• Fixed a critical bug in stream write liaison where shard ID matching was missing

Reviewed changes

Copilot reviewed 37 out of 37 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/integration/standalone/inspect/inspect_suite_test.go	New integration tests for inspect in standalone mode
test/integration/distributed/inspect/inspect_suite_test.go	New integration tests for inspect in distributed mode
pkg/index/inverted/inverted.go	Added Stats() method to return index statistics
pkg/index/index.go	Added Stats() to Store interface
banyand/internal/storage/storage.go	Added Stats() to IndexDB interface
banyand/internal/storage/index.go	Implemented Stats() for seriesIndex
banyand/metadata/schema/schema.go	Added data and liaison info collector interfaces
banyand/metadata/schema/etcd.go	Implemented data/liaison info collection with broadcasting
banyand/metadata/metadata.go	Extended Service interface with collector methods
banyand/metadata/client.go	Implemented collector registration and broadcaster setup
api/data/*.go	Added new topics for data and liaison info collection
banyand/trace/*.go	Implemented trace service data/liaison collection
banyand/stream/*.go	Implemented stream service data/liaison collection
banyand/measure/*.go	Implemented measure service data/liaison collection
banyand/liaison/grpc/registry.go	Implemented Inspect gRPC endpoint
banyand/internal/wqueue/wqueue.go	Added Shards() method for queue inspection
banyand/stream/write_liaison.go	Fixed critical bug: added shardID matching
banyand/**/tstable.go	Added pendingDataCount tracking
banyand/**/introducer.go	Decremented pendingDataCount on introduction
banyand/trace/merger.go	Added tf.reset() after merge to prevent memory leak
pkg/cmdsetup/liaison.go	Registered broadcasters for liaison setup

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[Copilot]

The comment is incomplete. It should say "collects data info for a specific group" instead of "collects data info for a specific."

Suggested change

	// CollectDataInfo collects data info for a specific.
	// CollectDataInfo collects data info for a specific group.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 5.47210% with 881 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.54%. Comparing base (3530dd9) to head (5f1262e).
⚠️ Report is 123 commits behind head on main.

Files with missing lines	Patch %	Lines
banyand/trace/metadata.go	1.77%	165 Missing and 1 partial ⚠️
banyand/stream/metadata.go	1.92%	152 Missing and 1 partial ⚠️
banyand/measure/metadata.go	0.75%	131 Missing ⚠️
banyand/metadata/schema/collector.go	0.00%	124 Missing ⚠️
banyand/liaison/grpc/registry.go	0.00%	85 Missing ⚠️
banyand/trace/svc_liaison.go	0.00%	36 Missing ⚠️
banyand/stream/svc_liaison.go	0.00%	32 Missing ⚠️
banyand/measure/svc_liaison.go	0.00%	27 Missing ⚠️
banyand/measure/svc_data.go	0.00%	19 Missing ⚠️
banyand/stream/svc_standalone.go	20.83%	18 Missing and 1 partial ⚠️
... and 13 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #947      +/-   ##
==========================================
+ Coverage   45.97%   46.54%   +0.56%     
==========================================
  Files         328      385      +57     
  Lines       55505    60549    +5044     
==========================================
+ Hits        25520    28183    +2663     
- Misses      27909    29729    +1820     
- Partials     2076     2637     +561     

Flag	Coverage Δ
banyand	48.73% <5.53%> (?)
bydbctl	81.91% <ø> (?)
fodc	78.73% <ø> (?)
integration-distributed	80.00% <ø> (?)
pkg	29.30% <0.00%> (?)

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[hanahmily]

etcd will become optional soon. Please do not add any new functionality to it. Instead, create a new struct to implement these features.

[hanahmily]

Invoke segment.DecRef() to release them.