feat: add group-metadata-members skill for inspecting GroupMetadata from heap dumps#11
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- Create .opencode/skills/group-metadata-members/SKILL.md with instructions for using mat-cli inspect-object and OQL queries against io.streamnative.pulsar.handlers.kop.coordinator.group.GroupMetadata
- Include sanitized example JSON output (fake data, no sensitive info)
- Register the skill in AGENTS.md
- Document the bundled decode_assignments.py script in SKILL.md
- Remove generic assignment decoding tip (replaced by the script)
…rom heap dumps - Create .opencode/skills/group-metadata-members/SKILL.md with instructions for using mat-cli inspect-object and OQL queries against io.streamnative.pulsar.handlers.kop.coordinator.group.GroupMetadata - Include sanitized example JSON output (fake data, no sensitive info) - Register the skill in AGENTS.md - Document the bundled decode_assignments.py script in SKILL.md - Remove generic assignment decoding tip (replaced by the script)
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Pull request overview
This PR introduces a new OpenCode skill (group-metadata-members) intended to help users extract and inspect Kafka consumer group member information from io.streamnative.pulsar.handlers.kop.coordinator.group.GroupMetadata objects in MAT heap dumps, including a helper script for decoding assignment bytes.
Changes:
- Added a new skill guide with MAT CLI
instances/inspect-objectusage and OQL recipes forGroupMetadata. - Added a bundled
decode_assignments.pyhelper to decode KafkaConsumerMemberAssignmentbytes from JSON dumps. - Registered the new skill in
AGENTS.md.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.
| File | Description |
|---|---|
AGENTS.md |
Registers the new group-metadata-members skill in the repo’s skill index. |
.opencode/skills/group-metadata-members/SKILL.md |
Adds step-by-step instructions and example output structure for inspecting GroupMetadata and members. |
.opencode/skills/group-metadata-members/decode_assignments.py |
Adds a Python helper for decoding member assignment bytes into a topic/partition ownership view. |
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| mat-cli inspect-object <heap-file> --address <address> \ | ||
| --field-paths groupId,generationId,protocolType,protocol,members | ||
| ``` |
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| mat-cli inspect-object <heap-file> --address <member-metadata-address> \ | ||
| --field-paths memberId,clientId,clientHost,sessionTimeout,rebalanceTimeout,groupInstanceId,subscription,assignment | ||
| ``` |
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| ```sql | ||
| SELECT m.value.memberId.toString(), m.value.clientId.toString(), m.value.clientHost.toString(), m.value.sessionTimeout, m.value.rebalanceTimeout, m.value.assignment.@length | ||
| FROM io.streamnative.pulsar.handlers.kop.coordinator.group.GroupMetadata g | ||
| OBJECTS g.members.table m | ||
| ``` |
| topic-b: missing partitions [2, 3, 4] ← ORPHANED | ||
| ``` | ||
|
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| The default input path is `group_metadata_members_ds.json` in the project root. Pass a different file as the first argument to override. |
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| path = sys.argv[1] if len(sys.argv) > 1 else \ | ||
| "group_metadata_members_ds.json" | ||
| main(path) |
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