From cfd9b9afb3a8d14f0023b3060a7e384be2ff57cf Mon Sep 17 00:00:00 2001
From: Jimmy Byrd <jimmy.byrd@motivity.net>
Date: Sun, 5 May 2024 18:52:31 -0400
Subject: [PATCH] Adds basic OTel Metric support to fsautocomplete

---
 paket.dependencies                  |  1 +
 paket.lock                          |  2 ++
 src/FsAutoComplete/Parser.fs        | 25 ++++++++++++++++++++-----
 src/FsAutoComplete/paket.references |  1 +
 4 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/paket.dependencies b/paket.dependencies
index 31cbcdaf1..ec3b96670 100644
--- a/paket.dependencies
+++ b/paket.dependencies
@@ -56,6 +56,7 @@ nuget Ionide.LanguageServerProtocol >= 0.4.23
 nuget Microsoft.Extensions.Caching.Memory
 nuget OpenTelemetry.Api >= 1.3.2
 nuget OpenTelemetry.Exporter.OpenTelemetryProtocol >= 1.3.2 # 1.4 bumps to 7.0 versions of System.Diagnostics libs, so can't use it
+nuget OpenTelemetry.Instrumentation.Runtime
 nuget LinkDotNet.StringBuilder 1.18.0
 nuget CommunityToolkit.HighPerformance
 nuget System.Security.Cryptography.Pkcs 6.0.4
diff --git a/paket.lock b/paket.lock
index 19c5cc39f..0f8ccb7af 100644
--- a/paket.lock
+++ b/paket.lock
@@ -378,6 +378,8 @@ NUGET
       Grpc (>= 2.44 < 3.0) - restriction: || (&& (== net6.0) (>= net462)) (&& (== net6.0) (< netstandard2.1)) (&& (== net7.0) (>= net462)) (&& (== net7.0) (< netstandard2.1)) (&& (== net8.0) (>= net462)) (&& (== net8.0) (< netstandard2.1)) (== netstandard2.0) (&& (== netstandard2.1) (>= net462))
       Grpc.Net.Client (>= 2.43 < 3.0) - restriction: || (== net6.0) (== net7.0) (== net8.0) (&& (== netstandard2.0) (>= netstandard2.1)) (== netstandard2.1)
       OpenTelemetry (>= 1.3.2)
+    OpenTelemetry.Instrumentation.Runtime (1.0)
+      OpenTelemetry.Api (>= 1.3 < 2.0)
     Perfolizer (0.2.1)
       System.Memory (>= 4.5.3)
     runtime.debian.8-x64.runtime.native.System.Security.Cryptography.OpenSsl (4.3.2)
diff --git a/src/FsAutoComplete/Parser.fs b/src/FsAutoComplete/Parser.fs
index 5ecee6b4f..1c85a7240 100644
--- a/src/FsAutoComplete/Parser.fs
+++ b/src/FsAutoComplete/Parser.fs
@@ -14,12 +14,14 @@ open FsAutoComplete.Lsp
 open OpenTelemetry
 open OpenTelemetry.Resources
 open OpenTelemetry.Trace
+open OpenTelemetry.Metrics
 
 module Parser =
   open FsAutoComplete.Core
   open System.Diagnostics
 
   let mutable tracerProvider = Unchecked.defaultof<_>
+  let mutable meterProvider = Unchecked.defaultof<_>
 
   [<Struct>]
   type Pos = { Line: int; Column: int }
@@ -194,19 +196,32 @@ module Parser =
   let configureOTel =
     Invocation.InvocationMiddleware(fun ctx next ->
 
+
+
       if ctx.ParseResult.GetValueForOption otelTracingOption then
+
         let serviceName = FsAutoComplete.Utils.Tracing.serviceName
         let version = FsAutoComplete.Utils.Version.info().Version
 
+        let resourceBuilder =
+          ResourceBuilder
+            .CreateDefault()
+            .AddService(serviceName = serviceName, serviceVersion = version)
+
+
+        meterProvider <-
+          Sdk
+            .CreateMeterProviderBuilder()
+            .AddMeter()
+            .AddRuntimeInstrumentation()
+            .SetResourceBuilder(resourceBuilder)
+            .AddOtlpExporter()
+            .Build()
         tracerProvider <-
           Sdk
             .CreateTracerProviderBuilder()
             .AddSource(serviceName, Tracing.fscServiceName)
-            .SetResourceBuilder(
-              ResourceBuilder
-                .CreateDefault()
-                .AddService(serviceName = serviceName, serviceVersion = version)
-            )
+            .SetResourceBuilder(resourceBuilder)
             .AddOtlpExporter()
             .Build()
 
diff --git a/src/FsAutoComplete/paket.references b/src/FsAutoComplete/paket.references
index 831027c3d..87af7001a 100644
--- a/src/FsAutoComplete/paket.references
+++ b/src/FsAutoComplete/paket.references
@@ -18,6 +18,7 @@ System.CommandLine
 FSharp.Data.Adaptive
 Microsoft.Extensions.Caching.Memory
 OpenTelemetry.Exporter.OpenTelemetryProtocol
+OpenTelemetry.Instrumentation.Runtime
 Microsoft.CodeAnalysis
 LinkDotNet.StringBuilder
 CommunityToolkit.HighPerformance