Make "Built in Metrics for Runtime" doc accurate for memory metrics #44616
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…llection.heap.size` should be called gc.heap.generation See DotNet repository - https://github.com/dotnet/runtime/blob/adf123c23ee42262515c36562b09fa0b19959599/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/RuntimeMetrics.cs#L191C110-L191C128
…similar attribute of `gc.heap.generation` See https://github.com/dotnet/runtime/blob/adf123c23ee42262515c36562b09fa0b19959599/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/RuntimeMetrics.cs#L195-L203
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Summary
I was looking at https://learn.microsoft.com/en-us/dotnet/core/diagnostics/built-in-metrics-runtime and spotted a couple of things which don't seem to align with reality, so I've tried to fix them with this PR.
Firstly, the metrics
dotnet.gc.last_collection.heap.sizeanddotnet.gc.collectionslistdotnet.gc.heap.generationas an attribute to mark the generation they are referring to. But when I checked the source code, the attribute is calledgc.heap.generation. This is also what I have experienced while using this new meter.Secondly, the metric
dotnet.gc.last_collection.heap.fragmentation.sizehas no attributes listed. But when I checked the source code it had an attribute similarly calledgc.heap.generation. This has been my experience with the library as well. To address that I have copied the table from thedotnet.gc.last_collection.heap.sizemetric because it is exactly the same concept.Hopefully this format of submission is okay, I'm still pretty new to open source submissions!
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