mds: Refactor Mantle::balance to use std::string

[edwinzrodriguez]

Refactor Mantle::balance to use std::string instead of std::string_view for script parameter

Fixes: https://tracker.ceph.com/issues/73429

Contribution Guidelines

• To sign and title your commits, please refer to Submitting Patches to Ceph.

• If you are submitting a fix for a stable branch (e.g. "quincy"), please refer to Submitting Patches to Ceph - Backports for the proper workflow.

• When filling out the below checklist, you may click boxes directly in the GitHub web UI. When entering or editing the entire PR message in the GitHub web UI editor, you may also select a checklist item by adding an x between the brackets: [x]. Spaces and capitalization matter when checking off items this way.

Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
  • New feature (ticket optional)
  • Doc update (no ticket needed)
  • Code cleanup (no ticket needed)
• Component impact
  • Affects Dashboard, opened tracker ticket
  • Affects Orchestrator, opened tracker ticket
  • No impact that needs to be tracked
• Documentation (select at least one)
  • Updates relevant documentation
  • No doc update is appropriate
• Tests (select at least one)
  • Includes unit test(s)
  • Includes integration test(s)
  • Includes bug reproducer
  • No tests

Show available Jenkins commands

• jenkins test classic perf Jenkins Job | Jenkins Job Definition
• jenkins test crimson perf Jenkins Job | Jenkins Job Definition
• jenkins test signed Jenkins Job | Jenkins Job Definition
• jenkins test make check Jenkins Job | Jenkins Job Definition
• jenkins test make check arm64 Jenkins Job | Jenkins Job Definition
• jenkins test submodules Jenkins Job | Jenkins Job Definition
• jenkins test dashboard Jenkins Job | Jenkins Job Definition
• jenkins test dashboard cephadm Jenkins Job | Jenkins Job Definition
• jenkins test api Jenkins Job | Jenkins Job Definition
• jenkins test docs ReadTheDocs | Github Workflow Definition
• jenkins test ceph-volume all Jenkins Jobs | Jenkins Jobs Definition
• jenkins test windows Jenkins Job | Jenkins Job Definition
• jenkins test rook e2e Jenkins Job | Jenkins Job Definition

You must only issue one Jenkins command per-comment. Jenkins does not understand
comments with more than one command.

[edwinzrodriguez]

jenkins test windows

[edwinzrodriguez]

jenkins test make check

[vshankar]

This PR is under test in https://tracker.ceph.com/issues/74158.

[github-actions]

This pull request has been automatically marked as stale because it has not had any activity for 60 days. It will be closed if no further activity occurs for another 30 days.
If you are a maintainer or core committer, please follow-up on this pull request to identify what steps should be taken by the author to move this proposed change forward.
If you are the author of this pull request, thank you for your proposed contribution. If you believe this change is still appropriate, please ensure that any feedback has been addressed and ask for a code review.

[vshankar]

This PR is under test in https://tracker.ceph.com/issues/75027.

[vshankar]

https://tracker.ceph.com/projects/cephfs/wiki/QA_main_--_2026#wip-vshankar-testing-20260219125903

[github-actions]

This is an automated message by src/script/redmine-upkeep.py.

I found one or more Fixes: tags in the commit messages in

git log b6f6b9c4a58f7d39ae29273c5f8caedc503922fb^..b6f6b9c4a58f7d39ae29273c5f8caedc503922fb

The referenced tickets are:

• https://tracker.ceph.com/issues/73429

Those tickets do not reference this merged Pull Request. If this Pull Request merge resolves any of those tickets, please update the "Pull Request ID" field on each ticket. A future run of this script will appropriately update them.

Update Log: https://github.com/ceph/ceph/actions/runs/22564155793