report detected features

apps/language_server/lib/language_server/cli.ex

@@ -108,25 +108,33 @@ defmodule ElixirLS.LanguageServer.CLI do
   end
 
   def check_otp_doc_chunks() do
-    if match?({:error, _}, Code.fetch_docs(:erlang)) do
+    supported = if match?({:error, _}, Code.fetch_docs(:erlang)) do
       JsonRpc.show_message(:warning, "OTP compiled without EEP48 documentation chunks")
 
       Logger.warning(
         "OTP compiled without EEP48 documentation chunks. Language features for erlang modules will run in limited mode. Please reinstall or rebuild OTP with appropriate flags."
       )
+      false
+    else
+      true
     end
+    JsonRpc.telemetry("eep48", %{"elixir_ls.eep48" => to_string(supported)}, %{})
   end
 
   def check_elixir_sources() do
     enum_ex_path = Enum.module_info()[:compile][:source]
 
-    unless File.exists?(enum_ex_path, [:raw]) do
+    elixir_sources_available = unless File.exists?(enum_ex_path, [:raw]) do
       dir = Path.join(enum_ex_path, "../../../..") |> Path.expand()
 
       Logger.notice(
         "Elixir sources not found (checking in #{dir}). Code navigation to Elixir modules disabled."
       )
+      false
+    else
+      true
     end
+    JsonRpc.telemetry("elixir_sources", %{"elixir_ls.elixir_sources" => to_string(elixir_sources_available)}, %{})
   end
 
   def check_otp_sources() do
@@ -137,12 +145,16 @@ defmodule ElixirLS.LanguageServer.CLI do
       |> to_string
       |> String.replace(~r/(.+)\/ebin\/([^\s]+)\.beam$/, "\\1/src/\\2.erl")
 
-    unless File.exists?(erlang_erl_path, [:raw]) do
+    otp_sources_available = unless File.exists?(erlang_erl_path, [:raw]) do
       dir = Path.join(erlang_erl_path, "../../../..") |> Path.expand()
 
       Logger.notice(
         "OTP sources not found (checking in #{dir}). Code navigation to OTP modules disabled."
       )
+      false
+    else
+      true
     end
+    JsonRpc.telemetry("otp_sources", %{"elixir_ls.otp_sources" => to_string(otp_sources_available)}, %{})
   end
 end