PMM-15092: fix InnoDB Row Reads legendFormat

[mattiasimonato]

Ticket number: PMM-15092

Feature build: SUBMODULES-4501

• Remove unused {{ operation }} from the InnoDB Row Reads legendFormat on MySQL InnoDB Details.
• The query filters operation="read" and groups only by service_name, so that template never resolves and breaks some downstream graph consumers.

Summary by CodeRabbit

• Bug Fixes
  • Updated the MySQL InnoDB dashboard legend to display the clearer static label “Rows.”

[coderabbitai]

Walkthrough

The MySQL InnoDB dashboard panel legend now displays the static label Rows instead of including the operation variable.

Changes

MySQL InnoDB dashboard

Layer / File(s)	Summary
Static Rows legend dashboards/dashboards/MySQL/MySQL_InnoDB_Details.json	The panel legend changed from Rows {{ operation }} to Rows.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: fabio-silva, matejkubinec, nailya

Poem

A rabbit hops through dashboard rows,
And trims the legend where the label grows.
“Rows,” says the hare,
“Clean and clear there!”
Then quietly back to the burrow it goes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly identifies the InnoDB Row Reads legend fix and includes the relevant ticket number.
Description check	✅ Passed	The description includes the ticket number, feature build, change summary, and technical rationale; optional sections do not require additional content.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch PMM-15092-fix-innodb-row-reads-legend

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.03%. Comparing base (31318c7) to head (8553f99).
⚠️ Report is 87 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5721      +/-   ##
==========================================
- Coverage   43.59%   37.03%   -6.56%     
==========================================
  Files         415      215     -200     
  Lines       43134     7168   -35966     
  Branches        0      585     +585     
==========================================
- Hits        18804     2655   -16149     
+ Misses      22454     4317   -18137     
+ Partials     1876      196    -1680     

Flag	Coverage Δ
admin	34.96% <ø> (+0.17%)	⬆️
agent	?
managed	?
unittests	41.29% <ø> (?)
vmproxy	?

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