[UX-508] added json/yaml formatting to rpk group describe command

[alextreichler]

Some customers may find it useful to be able to see the output of certain rpk commands in either json or yaml, as it is easier to parse using other tools. This feature adds the ability to output rpk group describe ... as json or yaml output using our global --formatter flag.

Fixes UX-508

Example json formatting:

rpk group describe abc --format help
{
  group_name: string
  coordinator_partition: string
  state: string
  balancer: string
  members: int
  coordinator_node: int
  total_lag: int
  partitions: []{
    partition: int
    current_offset: int
    log_start_offset: int
    log_end_offset: int
    lag: int
    topic: string
    member_id: string
    client_id: string
    host: string
  }
  members_details: []{
    member_id: string
    client_id: string
    host: string
    topic_partitions: []{
      topic: string
      partition: int
    }
  }
}

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v25.2.x
• v25.1.x
• v24.3.x

Release Notes

• Added the ability to output rpk group describe ... --formatted json as json or yaml using the --formatted flag.

Bug Fixes

Features

• Added the ability to output rpk group describe ... --formatted json as json or yaml using the --formatted flag.

Improvements

[vbotbuildovich]

Retry command for Build#72625

please wait until all jobs are finished before running the slash command

/ci-repeat 1
tests/rptest/tests/cluster_quota_test.py::ClusterRateQuotaTest.test_client_response_throttle_mechanism_applies_to_next_request

[vbotbuildovich]

CI test results

test results on build#72625

test_class	test_method	test_arguments	test_kind	job_url	test_status	passed	reason	test_history
EndToEndCloudTopicsTxTest	test_write	null	integration	https://buildkite.com/redpanda/redpanda/builds/72625#01996495-8e16-4865-a1ae-6021fc0ea0a8	FLAKY	17/21	upstream reliability is '93.69369369369369'. current run reliability is '80.95238095238095'. drift is 12.74131 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=EndToEndCloudTopicsTxTest&test_method=test_write
ClusterRateQuotaTest	test_client_group_consume_rate_throttle_mechanism	null	integration	https://buildkite.com/redpanda/redpanda/builds/72625#01996495-8e16-4865-a1ae-6021fc0ea0a8	FLAKY	17/21	upstream reliability is '98.42931937172776'. current run reliability is '80.95238095238095'. drift is 17.47694 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ClusterRateQuotaTest&test_method=test_client_group_consume_rate_throttle_mechanism
ClusterRateQuotaTest	test_client_response_throttle_mechanism_applies_to_next_request	null	integration	https://buildkite.com/redpanda/redpanda/builds/72625#01996495-8e10-49a9-9660-ac5fef426497	FLAKY	13/21	upstream reliability is '100.0'. current run reliability is '61.904761904761905'. drift is 38.09524 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ClusterRateQuotaTest&test_method=test_client_response_throttle_mechanism_applies_to_next_request
ClusterRateQuotaTest	test_client_response_throttle_mechanism_applies_to_next_request	null	integration	https://buildkite.com/redpanda/redpanda/builds/72625#0199649b-e6ef-4f39-90c7-769609fbd9d7	FLAKY	9/21	upstream reliability is '100.0'. current run reliability is '42.857142857142854'. drift is 57.14286 and the allowed drift is set to 50. The test should FAIL	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ClusterRateQuotaTest&test_method=test_client_response_throttle_mechanism_applies_to_next_request
RecoveryModeTest	test_rolling_restart	null	integration	https://buildkite.com/redpanda/redpanda/builds/72625#01996495-8e10-49a9-9660-ac5fef426497	FLAKY	17/21	upstream reliability is '100.0'. current run reliability is '80.95238095238095'. drift is 19.04762 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=RecoveryModeTest&test_method=test_rolling_restart
WriteCachingFailureInjectionTest	test_unavoidable_data_loss	null	integration	https://buildkite.com/redpanda/redpanda/builds/72625#01996495-8e0f-487a-bf90-13e5f8cfdbb8	FLAKY	19/21	upstream reliability is '97.41935483870968'. current run reliability is '90.47619047619048'. drift is 6.94316 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=WriteCachingFailureInjectionTest&test_method=test_unavoidable_data_loss

test results on build#72636

test_class	test_method	test_arguments	test_kind	job_url	test_status	passed	reason	test_history
EndToEndCloudTopicsTest	test_write	null	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996891-ea0f-4a72-8ad3-9ff597297789	FLAKY	12/21	upstream reliability is '94.58823529411765'. current run reliability is '57.14285714285714'. drift is 37.44538 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=EndToEndCloudTopicsTest&test_method=test_write
ShadowLinkConsumeGroupsMirroringTest	test_continuous_group_sync	{"source_cluster_spec": {"cluster_type": "redpanda"}, "with_failures": true}	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996898-cb3c-4688-b270-f05d60eaf234	FLAKY	15/21	upstream reliability is '91.44981412639405'. current run reliability is '71.42857142857143'. drift is 20.02124 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ShadowLinkConsumeGroupsMirroringTest&test_method=test_continuous_group_sync
ClusterRateQuotaTest	test_client_group_produce_rate_throttle_mechanism	null	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996891-ea04-4855-b971-cf0ad24dcc83	FLAKY	16/21	upstream reliability is '97.75'. current run reliability is '76.19047619047619'. drift is 21.55952 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ClusterRateQuotaTest&test_method=test_client_group_produce_rate_throttle_mechanism
ClusterRateQuotaTest	test_client_group_produce_rate_throttle_mechanism	null	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996898-cb36-4a2f-9992-f70e4d905efe	FLAKY	14/21	upstream reliability is '97.75'. current run reliability is '66.66666666666666'. drift is 31.08333 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ClusterRateQuotaTest&test_method=test_client_group_produce_rate_throttle_mechanism
ClusterRateQuotaTest	test_client_response_throttle_mechanism_applies_to_next_request	null	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996898-cb3a-466f-8379-e713c53f49ec	FLAKY	18/21	upstream reliability is '98.44155844155844'. current run reliability is '85.71428571428571'. drift is 12.72727 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ClusterRateQuotaTest&test_method=test_client_response_throttle_mechanism_applies_to_next_request
NodeWiseRecoveryTest	test_recovery_local_data_missing	{"wait_for_final_manifest_uploads": true}	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996891-ea05-43c0-a7e7-64cee4489f31	FLAKY	8/21	upstream reliability is '95.77464788732394'. current run reliability is '38.095238095238095'. drift is 57.67941 and the allowed drift is set to 50. The test should FAIL	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=NodeWiseRecoveryTest&test_method=test_recovery_local_data_missing
NodeWiseRecoveryTest	test_recovery_local_data_missing	{"wait_for_final_manifest_uploads": true}	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996898-cb37-4838-be63-1196f35a2fbb	FLAKY	18/21	upstream reliability is '95.77464788732394'. current run reliability is '85.71428571428571'. drift is 10.06036 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=NodeWiseRecoveryTest&test_method=test_recovery_local_data_missing
DisablingPartitionsTest	test_disable	null	integration	https://buildkite.com/redpanda/redpanda/builds/72636#01996891-ea0e-4fc5-b1aa-4a674956cfe7	FLAKY	13/21	upstream reliability is '97.07207207207207'. current run reliability is '61.904761904761905'. drift is 35.16731 and the allowed drift is set to 50. The test should PASS	https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=DisablingPartitionsTest&test_method=test_disable

[vbotbuildovich]

Retry command for Build#72636

please wait until all jobs are finished before running the slash command

/ci-repeat 1
tests/rptest/tests/partition_force_reconfiguration_test.py::NodeWiseRecoveryTest.test_recovery_local_data_missing@{"wait_for_final_manifest_uploads":true}

[vbotbuildovich]

/backport v25.2.x