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Use when collecting or analyzing production iOS or iPadOS performance telemetry with MetricKit, including iOS 27 MetricManager async metric or diagnostic reports, hang or crash triage, custom signposts, extended launch measurement, durable export, or iOS 26 MXMetricManager compatibility.
Passed 22 of 22 test cases with the skill, and 8 of 22 without it.
and 22 more in the full report
14 fixed8 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.
We need to safely persist received MetricReport objects to disk in our iOS telemetry worker before marking processing complete. What Swift protocol conformance allows MetricReport to be stored as JSON?
| Checked | Without skill | With skill |
|---|---|---|
| Uses JSONEncoder to serialize MetricReport conforming to Codable | Passed | Passed |
| Stores the encoded JSON data atomically in local storage before upload | Missed | Passed |
The instructions your model reads when the skill loads.
Use MetricKit for low-overhead production telemetry that complements local Instruments and Xcode Organizer analysis. On iOS and iPadOS 27, prefer the Swift-first MetricManager report sequences. Keep MXMetricManager only in an explicit iOS 26 compatibility branch.
Beta-sensitive: The iOS/iPadOS 27 surface below is based on Apple's current beta documentation. It has not been locally compiler-verified because Xcode 27 is unavailable in this environment. Re-check the linked Apple documentation and compile with the shipping Xcode 27 SDK before release.
Load MetricKit Extended and Compatibility Patterns when implementing durable ingestion, detailed report analysis, or the iOS 26 compatibility path.
At app launch, create and retain one long-lived MetricManager. Start exactly one consumer task for metricReports and one for diagnosticReports.
Both properties expose nonthrowing AsyncSequence values:
metricReports: some AsyncSequence<MetricReport, Never>diagnosticReports: some AsyncSequence<DiagnosticReport, Never>Apple documents that concurrent consumers of one sequence can receive nondeterministic subsets. Fan out only after the single consumer receives and durably stores a report; delayed subscription can miss reports.
import MetricKit
@available(iOS 27.0, *)
test cases passed, vs 8 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.