Record batch machine command timings

[karenychen]

Summary

• record per-batch BatchPutMachine command timings in AKSMachineClient
• emit batch_command_execution_times as scale_machine operation metadata
• cover metric capture and metadata emission in machine-client tests

Tests

• PYTHONPATH=modules/python python3 -m pytest modules/python/tests/test_aks_machine_client.py modules/python/tests/test_machine_crud.py modules/python/tests/test_crud_main.py
• git diff --check

[Copilot]

Pull request overview

This PR extends the AKS Machine scale-out path to capture per-batch BatchPutMachine timing metrics and emit them as operation metadata, with accompanying test updates to validate metric capture and metadata emission.

Changes:

• Record per-batch start/end timestamps and execution duration in _create_batch_machines.
• Emit batch_command_execution_times as scale_machine operation metadata when use_batch_api=True.
• Update machine-client tests to cover timing metric capture and metadata emission.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
modules/python/clients/aks_machine_client.py	Captures per-batch timing metrics and emits them as scale_machine operation metadata.
modules/python/tests/test_aks_machine_client.py	Extends tests to assert timing metrics are captured and metadata is emitted for the batch path.

Comments suppressed due to low confidence (1)

modules/python/clients/aks_machine_client.py:921

• execution_time_seconds is derived from datetime.now() deltas, which can go negative or be skewed if the system clock adjusts (e.g., NTP). For durations, use a monotonic timer (time.perf_counter() / time.monotonic()) and keep datetime only for the wall-clock timestamps.

        start_time = datetime.now(timezone.utc)
        self._make_batch_request(
            "PUT",
            url,
            body,

[karenychen]

Code review

No issues found. Checked for bugs and AGENTS.md compliance.

[xuexu6666]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.