Did you find some sort of answer to this?
williamgrand
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I could not find how to measure the performance for MetricKit signpost anywhere. A WWDC19 video suggested to look up documentation on it, but it doesn't exist.
Thankfully, in Instruments, I found that the subcategory for the OSLog signpost created by MXMetricManager.makeLogHandle(category:) is com.apple.metrickit.log. Therefore, in order to measure the performance of your block, you do something like the following:
measure(metrics: [XCTOSSignpostMetric(subsystem: "com.apple.metrickit.log",
category: "My category",
name: "My name")]) {
...
}