Visualize a OpenTelemetry metric in Prometheus in a MAUI app

[camiloJaramillo5]

Hi guys!

I´m trying to visualize an open telemetry metric in prometheus + grafana tools from a Maui app without success. For a normal web API project it works perfectly but it seems that for a Maui app the AddOtlpExporter() doesn´t work.

This is what I´m doing in the web API project:

and this is the result:

and these are the corresponding yml files (to run the docker-compose command) :

For the Maui app, I´m doing pretty much the same configuration:

but I´m not able to see the metric in the docker prometheus graph.

Can you help me please?

[v-antunovic]

@camiloJaramillo5 Did you ever figure out this issue? I am looking into implementing open telemetry into MAUI app and so far I had 0 success. Can't get any output out of it.

[camiloJaramillo5]

Sorry, I didn´t realize about your question. Yes, I could.
I have an example in my personal github account:

[camiloJaramillo5]

the important thing is to use and configure properly the Prometheus exporter

[ChrisHolcomb]

I have managed to get Tracing to work in debug mode but it crashes the app in release mode.

Gives me this error:

2024-02-05 13:28:12.535268-0600 SensysMaui[9666:12079204]
Unhandled Exception:
System.TypeInitializationException: TypeInitialization_Type, OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ActivityExtensions
---> System.PlatformNotSupportedException: PlatformNotSupported_ReflectionEmit
at System.Reflection.Emit.AssemblyBuilder.ThrowDynamicCodeNotSupported()
at System.Reflection.Emit.AssemblyBuilder.EnsureDynamicCodeSupported()
at System.Reflection.Emit.DynamicMethod.Init(String name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] signature, Type owner, Module m, Boolean skipVisibility, Boolean transparentMethod)
at System.Reflection.Emit.DynamicMethod..ctor(String name, Type returnType, Type[] parameterTypes, Module m, Boolean skipVisibility)
at OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ActivityExtensions.CreateRepeatedFieldOfSpanSetCountAction()
at OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ActivityExtensions..cctor()
Exception_EndOfInnerExceptionStack
at OpenTelemetry.Exporter.OtlpTraceExporter.Export(Batch1& activityBatch) at OpenTelemetry.BatchExportProcessor1[[System.Diagnostics.Activity, System.Diagnostics.DiagnosticSource, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].ExporterProc()
at System.Threading.Thread.StartHelper.Callback(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Thread.StartCallback()
2024-02-05 13:28:12.537925-0600 SensysMaui[9666:12079204] Unhandled managed exception: TypeInitialization_Type, OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ActivityExtensions (System.TypeInitializationException)
at OpenTelemetry.Exporter.OtlpTraceExporter.Export(Batch1& activityBatch) at OpenTelemetry.BatchExportProcessor1[[System.Diagnostics.Activity, System.Diagnostics.DiagnosticSource, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].ExporterProc()
at System.Threading.Thread.StartHelper.Callback(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Thread.StartCallback()
PlatformNotSupported_ReflectionEmit (System.PlatformNotSupportedException)
at System.Reflection.Emit.AssemblyBuilder.ThrowDynamicCodeNotSupported()
at System.Reflection.Emit.AssemblyBuilder.EnsureDynamicCodeSupported()
at System.Reflection.Emit.DynamicMethod.Init(String name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] signature, Type owner, Module m, Boolean skipVisibility, Boolean transparentMethod)
at System.Reflection.Emit.DynamicMethod..ctor(String name, Type returnType, Type[] parameterTypes, Module m, Boolean skipVisibility)
at OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ActivityExtensions.CreateRepeatedFieldOfSpanSetCountAction()
at OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.ActivityExtensions..cctor()

=================================================================
Native Crash Reporting

Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.

=================================================================
Native stacktrace:

0x10d740485 - /Users/chris/Library/Developer/CoreSimulator/Devices/D2F13235-E525-4B1F-91C5-13E2E078BFCD/data/Containers/Bundle/Application/4CFA6419-AEBE-4067-AC48-08D8B995C309/SensysMaui.app/libmonosgen-2.0.dylib : mono_dump_native_crash_info
0x10d6dee1e - /Users/chris/Library/Developer/CoreSimulator/Devices/D2F13235-E525-4B1F-91C5-13E2E078BFCD/data/Containers/Bundle/Application/4CFA6419-AEBE-4067-AC48-08D8B995C309/SensysMaui.app/libmonosgen-2.0.dylib : mono_handle_native_crash
0x10da37b58 - /Users/chris/Library/Developer/CoreSimulator/Devices/D2F13235-E525-4B1F-91C5-13E2E078BFCD/data/Containers/Bundle/Application/4CFA6419-AEBE-4067-AC48-08D8B995C309/SensysMaui.app/libmonosgen-2.0.dylib : sigabrt_signal_handler.cold.1
0x10d73fdc0 - /Users/chris/Library/Developer/CoreSimulator/Devices/D2F13235-E525-4B1F-91C5-13E2E078BFCD/data/Containers/Bundle/Application/4CFA6419-AEBE-4067-AC48-08D8B995C309/SensysMaui.app/libmonosgen-2.0.dylib : mono_runtime_setup_stat_profiler
0x12521737d - /usr/lib/system/libsystem_platform.dylib : _sigtramp
0x0 - Unknown
0x124b39d30 - /Library/Developer/CoreSimulator/Volumes/iOS_21C62/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 17.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_c.dylib : abort
0x10c861886 - /Users/chris/Library/Developer/CoreSimulator/Devices/D2F13235-E525-4B1F-91C5-13E2E078BFCD/data/Containers/Bundle/Application/4CFA6419-AEBE-4067-AC48-08D8B995C309/SensysMaui.app/libxamarin-dotnet.dylib : xamarin_unhandled_exception_handler
0x10d7de184 - /Users/chris/Library/Developer/CoreSimulator/Devices/D2F13235-E525-4B1F-91C5-13E2E078BFCD/data/Containers/Bundle/Application/4CFA6419-AEBE-4067-AC48-08D8B995C309/SensysMaui.app/libmonosgen-2.0.dylib : mono_invoke_unhandled_exception_hook
0x10d8425fe - /Users/chris/Library/Developer/CoreSimulator/Devices/D2F13235-E525-4B1F-91C5-13E2E078BFCD/data/Containers/Bundle/Application/4CFA6419-AEBE-4067-AC48-08D8B995C309/SensysMaui.app/libmonosgen-2.0.dylib : start_wrapper
0x12523e202 - /usr/lib/system/libsystem_pthread.dylib : _pthread_start
0x125239bab - /usr/lib/system/libsystem_pthread.dylib : thread_start

=================================================================
Basic Fault Address Reporting

Memory around native instruction pointer (0x1252b87a2):0x1252b8792 ff ff c3 90 90 90 b8 48 01 00 02 49 89 ca 0f 05 .......H...I....
0x1252b87a2 73 08 48 89 c7 e9 d8 99 ff ff c3 90 90 90 b8 53 s.H............S
0x1252b87b2 00 00 02 49 89 ca 0f 05 73 08 48 89 c7 e9 c0 99 ...I....s.H.....
0x1252b87c2 ff ff c3 90 90 90 b8 83 01 00 02 49 89 ca 0f 05 ...........I....

=================================================================
Managed Stacktrace:

=================================================================

[cijothomas]

are you in the latest version of the sdk and otlp exporter?
Dynamic generated code were removed sometime ago, so the newest should be tried.

[SVerma799]

Does anybody got success to this. I tried everything and sharing my issue link as well what I posted.

@camiloJaramillo5 @cijothomas @ChrisHolcomb @viktor246

dotnet/maui#21165

My Research says that System.Diagnostics.Metric.Meter does have _instrument as it add when ran as a android application.
All I need to know that System.Diagnostic is supported only to the windows application.

that is my counter is enabled true in windows and false in case of android emulator.

[SVerma799]

I Found out the solution to this

trying setting
system.Diagnostics.Metrics.Meter.issupported =true before CreatingMAUIApp in MainApplication.cs constructor.