calling monitorEventLoopDelay causes Not implemented error

[5d-jh]

Throwing Not implemented in perf_hooks. monitorEventLoopDelay breaks prom-client's eventLoopLag function. Since prom-client provides workaround logic when it's not exist on older nodejs runtime, set monitorEventLoopDelay to undefined instead would work seamlessly.

Aside from prom-client, setting undefined instead of placeholder function seems more intuitive.

[SebastienGllmt]

There are multiple things in perf_hooks not implemented. For example, createHistogram is used by piscina but it's not implemented in deno which leads to a crash

Notably, (more generally than the piscina issue), I believe the current list of missing APIs at the time of posting are

From the performance object

• clearMeasures
• clearMeasures
• clearResourceTimings
• getEntries
• setResourceTimingBufferSize

Top-level functions:

• createHistogram

The following classes:

• PerformanceMark
• PerformanceMeasure
• PerformanceNodeEntry
• PerformanceNodeTiming
• PerformanceResourceTiming
• PerformanceObserverEntryList
• Histogram
• IntervalHistogram
• RecordableHistogram

just sharing the list here so that if people search any of these in the Deno repo they find this message in the result