Conciseness

The scope is stated three times over — the intro paragraph ("Implement effective Java metrics instrumentation..."), the seven "What is covered in this Skill?" bullets, and the "When to use this skill" list that repeats the description's triggers verbatim — so it goes beyond the "minor instances" of the 4 anchor into "could be tightened" territory.

Actionability

Concrete elements exist ("Run `./mvnw clean verify`", "Never tag metrics with unbounded values (userId, UUID, raw URL, full exception message)", and a pointer to the real references file), but the workflow steps stay abstract ("Apply Counter/Timer/Gauge/DistributionSummary/LongTaskTimer where appropriate") with no inline code, matching the 3 anchor's "some concrete guidance but incomplete; missing key details" rather than 4's mostly-executable standard.

Workflow Clarity

The four-step workflow is clearly sequenced and ends with an explicit validation checkpoint ("VERIFY: Run `./mvnw clean verify` or `mvn clean verify` after changes"), fitting the 4 anchor. It falls short of 5 because there is no error-recovery feedback loop (validate → fix → re-validate) spelled out.

Progressive Disclosure

The body is a clean overview that defers all detail to a single, well-signaled, one-level-deep reference ("For detailed guidance, examples, and constraints, see [references/182-java-observability-metrics-micrometer.md]") which exists and itself contains no further nested references — matching the 5 anchor's clear overview with easy navigation.

Specificity

"meter design, naming/tag conventions, cardinality control, timers/counters/gauges/distribution summaries, percentiles/histograms, Actuator/Prometheus integration, and metrics validation through tests" is comprehensive concrete coverage matching the 5 anchor, but the second-person phrasing "Use when you need to implement" triggers the rubric's 1-point specificity penalty, landing it at 4.

Completeness

It explicitly answers both what ("implement or improve Java metrics observability with Micrometer — including...") and when ("Use when you need to... This should trigger for requests such as..."), matching the 5 anchor's requirement of concrete trigger phrases paired with a clear capability list.

Trigger Term Quality

Natural user phrasings are explicitly enumerated — "Improve metrics; Apply Micrometer; Add metrics observability; Refactor Micrometer instrumentation; Add Micrometer timers counters or gauges to Java services" — plus synonyms (observability, instrumentation, Prometheus, Actuator), giving comprehensive natural-term coverage. It sits squarely at the 5 anchor, not 4, since no common variation a user would say is missing.

Distinctiveness Conflict Risk

"Java metrics observability with Micrometer" is a clear niche with tool- and language-specific triggers, making wrong-skill activation unlikely. It is at the 5 anchor rather than 4 because the Micrometer/Java scoping leaves minimal overlap even with adjacent observability skills.