Histogram custom tags are not parsed correctly and not showing up.

Description

Histogram meter custom tags value are not parsed using correct separater "=", as when sending up Histogram (AggregatePercentilePayload) with custom tags to dotnet monitor, in file MetricStore.cs line, it's missing a case for "AggregatePercentilePayload", which caused the IsMeter method to return false, and using ":" to parse custom tags, as a result, it returns nothing as custom tags.

Configuration

What OS and version, and what distro if applicable? MacOS 14.6.1 (23G93)
What is the architecture (x64, x86, ARM, ARM64)? ARM64
Do you know whether it is specific to that configuration? By looking at the source, I don't think it's specific to certain configurations.
Are you running in any particular type of environment? (e.g. Containers, a cloud scenario, app you are trying to target is a different user) No
Is it a self-contained published application? No
What's the output of dotnet info `.NET SDK: Version: 8.0.203 Commit: 5e1ceea679 Workload version: 8.0.200-manifests.205a5945

Runtime Environment: OS Name: Mac OS X OS Version: 14.6 OS Platform: Darwin RID: osx-arm64 Base Path: /usr/local/share/dotnet/sdk/8.0.203/

.NET workloads installed: There are no installed workloads to display.

Host: Version: 9.0.0-rc.2.24473.5 Architecture: arm64 Commit: 990ebf52fc

.NET SDKs installed: 6.0.418 [/usr/local/share/dotnet/sdk] 7.0.405 [/usr/local/share/dotnet/sdk] 8.0.203 [/usr/local/share/dotnet/sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 6.0.26 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 7.0.15 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 8.0.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 9.0.0-rc.2.24474.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 6.0.26 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.15 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 8.0.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 9.0.0-rc.2.24473.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found: None

Environment variables: Not set

global.json file: Not found

Learn more: https://aka.ms/dotnet/info

Download .NET: https://aka.ms/dotnet/download `

Regression?

No, from the source code, this may never worked before for Histogram custom tags.

Other information

It seems the issue is in MetricStore.cs => IsMeter method, and adding additional case for AggregatePercentilePayload seems to do the trick.

dotnet / dotnet-monitor