fix: clarify reclaim condition on redpanda_memory_allocated_memory

[micheleRP]

Summary

• Adds "if needed" to the redpanda_memory_allocated_memory description so the batch cache reclaim phrasing is technically accurate.
• Follow-up to fix: improve discoverability of partition_autobalancing_mode and redpanda_memory_allocated_memory #1656 addressing a post-merge review nit from @bharathv: fix: improve discoverability of partition_autobalancing_mode and redpanda_memory_allocated_memory #1656 (comment)

Preview pages

• Public Metrics (updated)

Test plan

• git diff shows only the intended one-word addition in modules/reference/pages/public-metrics-reference.adoc
• CI (link checker, lint) green
• Reviewer confirms wording

🤖 Generated with Claude Code

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request updates the documentation for the redpanda_memory_allocated_memory metric in the public metrics reference. The change modifies the description of reclaimable batch cache memory to clarify that it is reclaimable "if needed" rather than unconditionally reclaimable. This is a single-line documentation clarification with no impact on code or functionality.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fix: improve discoverability of partition_autobalancing_mode and redpanda_memory_allocated_memory #1656 — Modifies the same documentation entry for redpanda_memory_allocated_memory, clarifying how reclaimable batch-cache memory is counted and when it can be reclaimed.
• docs: add clarification about memory usage #1237 — Updates documentation for redpanda_memory_allocated_memory and related memory-availability guidance regarding reclaimable batch-cache memory.

Suggested reviewers

• bharathv
• tyson-redpanda

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: clarifying the reclaim condition in documentation for a specific metric.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	PR description includes summary, preview link, and test plan checklist. Missing required Jira ticket reference and review deadline from template.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/memory-allocated-reclaim-nit

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