KAFKA-9152; Improve Sensor Retrieval

[highluck]

Fixed to save only when there is no space for efficiency :)

More detailed description of your change,
if necessary. The PR title and PR message become
the squashed commit message, so use a separate
comment to ping reviewers.

Summary of testing strategy (including rationale)
for the feature or bug fix. Unit and/or integration
tests are expected for any behaviour change and
system tests should be considered for larger changes.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[cadonna]

@highluck Thank you for your PR

You also need to adapt the unit tests in StreamsMetricsImplTest.

Here my comments.