pandaproxy: add missing internal metrics

[IoannisRP]

The pandaproxy metrics request_errors_total where only present in the public metrics and not in the internal metrics.

• Added request_errors_total in internal metrics.

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
• v24.3.x
• v24.2.x
• v24.1.x

Release Notes

• none

[BenPope]

LGTM

[vbotbuildovich]

Retry command for Build#59722

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

/ci-repeat 1
tests/rptest/tests/random_node_operations_test.py::RandomNodeOperationsTest.test_node_operations@{"cloud_storage_type":2,"enable_failures":false,"mixed_versions":false,"with_iceberg":true,"with_tiered_storage":false}
tests/rptest/tests/random_node_operations_test.py::RandomNodeOperationsTest.test_node_operations@{"cloud_storage_type":2,"enable_failures":false,"mixed_versions":false,"with_iceberg":true,"with_tiered_storage":true}
tests/rptest/tests/random_node_operations_test.py::RandomNodeOperationsTest.test_node_operations@{"cloud_storage_type":2,"enable_failures":true,"mixed_versions":false,"with_iceberg":true,"with_tiered_storage":false}
tests/rptest/tests/random_node_operations_test.py::RandomNodeOperationsTest.test_node_operations@{"cloud_storage_type":2,"enable_failures":true,"mixed_versions":false,"with_iceberg":true,"with_tiered_storage":true}

[vbotbuildovich]

CI test results

test results on build#59722

test_id	test_kind	job_url	test_status	passed
rptest.tests.cloud_storage_scrubber_test.CloudStorageScrubberTest.test_scrubber.cloud_storage_type=CloudStorageType.ABS	ducktape	https://buildkite.com/redpanda/redpanda/builds/59722#0193c024-01f9-426c-8653-597543625d33	FLAKY	5/6
rptest.tests.random_node_operations_test.RandomNodeOperationsTest.test_node_operations.enable_failures=False.mixed_versions=False.with_tiered_storage=False.with_iceberg=True.cloud_storage_type=CloudStorageType.ABS	ducktape	https://buildkite.com/redpanda/redpanda/builds/59722#0193c007-f69a-491d-bd06-830262e5768d	FAIL	0/1
rptest.tests.random_node_operations_test.RandomNodeOperationsTest.test_node_operations.enable_failures=False.mixed_versions=False.with_tiered_storage=True.with_iceberg=True.cloud_storage_type=CloudStorageType.ABS	ducktape	https://buildkite.com/redpanda/redpanda/builds/59722#0193c007-f69a-491d-bd06-830262e5768d	FAIL	0/1
rptest.tests.random_node_operations_test.RandomNodeOperationsTest.test_node_operations.enable_failures=True.mixed_versions=False.with_tiered_storage=False.with_iceberg=True.cloud_storage_type=CloudStorageType.ABS	ducktape	https://buildkite.com/redpanda/redpanda/builds/59722#0193c007-f69a-491d-bd06-830262e5768d	FAIL	0/1
rptest.tests.random_node_operations_test.RandomNodeOperationsTest.test_node_operations.enable_failures=True.mixed_versions=False.with_tiered_storage=True.with_iceberg=True.cloud_storage_type=CloudStorageType.ABS	ducktape	https://buildkite.com/redpanda/redpanda/builds/59722#0193c007-f69a-491d-bd06-830262e5768d	FAIL	0/1

[IoannisRP]

CI failures:

• CORE-7215

[vbotbuildovich]

/backport v24.3.x

[vbotbuildovich]

/backport v24.2.x

[vbotbuildovich]

/backport v24.1.x

[vbotbuildovich]

Failed to create a backport PR to v24.1.x branch. I tried:

git remote add upstream https://github.com/redpanda-data/redpanda.git
git fetch --all
git checkout -b backport-pr-24564-v24.1.x-519 remotes/upstream/v24.1.x
git cherry-pick -x b90c9f0f8d 939face46b

Workflow run logs.