Remove EKG (#4163)

It's always been a pain and it's not really used.

Fixes #3993

bench/Main.hs

@@ -202,8 +202,6 @@ buildHls Cabal root out = actionBracket
         liftIO $ writeFile projectLocal $ unlines
             ["package haskell-language-server"
             ,"  ghc-options: -eventlog -rtsopts"
-            ,"package ghcide"
-            ,"  flags: +ekg"
             ]
         return projectLocalExists)
     (\projectLocalExists -> do

cabal.project

@@ -42,32 +42,3 @@ constraints:
   -- We want to be able to benefit from the performance optimisations
   -- in the future, thus: TODO: remove this flag.
   bitvec -simd
-
--- This is benign and won't affect our ability to release to Hackage,
--- because we only depend on `ekg-json` when a non-default flag
--- is turned on.
--- DELETE MARKER FOR CI
--- centos7 has an old version of git which cabal doesn't
--- support. We delete these lines in gitlab ci to workaround
--- this issue, as this is not necessary to build our binaries.
-source-repository-package
-  type:git
-  location: https://github.com/pepeiborra/ekg-json
-  tag: 7a0af7a8fd38045fd15fb13445bdcc7085325460
--- END DELETE
-
-if impl(ghc >= 9.1)
-  -- ekg packagess are old and unmaintained, but we
-  -- don't rely on them for the mainline build, so
-  -- this is okay
-  allow-newer:
-    ekg-json:base,
-    ekg-wai:time,
-    ekg-core:ghc-prim
-
-if impl(ghc >= 9.7)
-  -- ekg packagess are old and unmaintained, but we
-  -- don't rely on them for the mainline build, so
-  -- this is okay
-  allow-newer:
-    ekg-core:text,

docs/contributing/contributing.md

@@ -198,17 +198,6 @@ See the [tutorial](./plugin-tutorial.md) on writing a plugin in HLS.
 
 ## Measuring, benchmarking and tracing
 
-### Metrics
-
-When ghcide is built with the `ekg` flag, HLS opens a metrics server on port 8999 exposing GC and ghcide metrics. The ghcide metrics currently exposed are:
-
-- `ghcide.values_count` - count of build results in the store
-- `ghcide.database_count` - count of build keys in the store (these two would be the same in the absence of GC)
-- `ghcide.build_count` - build count. A key is GC'ed if it is dirty and older than 100 builds
-- `ghcide.dirty_keys_count` - non transitive count of dirty build keys
-- `ghcide.indexing_pending_count` - count of items in the indexing queue
-- `ghcide.exports_map_count` - count of identifiers in the exports map.
-
 ### Benchmarks
 
 If you are touching performance sensitive code, take the time to run a differential

ghcide/exe/Arguments.hs

@@ -20,7 +20,6 @@ data Arguments = Arguments
     ,argsVerbose                    :: Bool
     ,argsCommand                    :: Command
     ,argsConservativeChangeTracking :: Bool
-    ,argsMonitoringPort             :: Int
     }
 
 getArguments :: IdePlugins IdeState -> IO Arguments
@@ -43,7 +42,6 @@ arguments plugins = Arguments
       <*> switch (short 'd' <> long "verbose" <> help "Include internal events in logging output")
       <*> (commandP plugins <|> lspCommand <|> checkCommand)
       <*> switch (long "conservative-change-tracking" <> help "disable reactive change tracking (for testing/debugging)")
-      <*> option auto (long "monitoring-port" <> metavar "PORT" <> value 8999 <> showDefault <> help "Port to use for EKG monitoring (if the binary is built with EKG)")
       where
           checkCommand = Check <$> many (argument str (metavar "FILES/DIRS..."))
           lspCommand = LSP <$ flag' True (long "lsp" <> help "Start talking to an LSP client")

ghcide/exe/Main.hs

@@ -18,7 +18,6 @@ import           Development.IDE.Core.Rules               (mainRule)
 import qualified Development.IDE.Core.Rules               as Rules
 import           Development.IDE.Core.Tracing             (withTelemetryLogger)
 import qualified Development.IDE.Main                     as IDEMain
-import qualified Development.IDE.Monitoring.EKG           as EKG
 import qualified Development.IDE.Monitoring.OpenTelemetry as OpenTelemetry
 import qualified Development.IDE.Plugin.HLS.GhcIde        as GhcIde
 import           Development.IDE.Types.Options
@@ -148,5 +147,5 @@ main = withTelemetryLogger $ \telemetryLogger -> do
                 , optRunSubset = not argsConservativeChangeTracking
                 , optVerifyCoreFile = argsVerifyCoreFile
                 }
-        , IDEMain.argsMonitoring = OpenTelemetry.monitoring <> EKG.monitoring logger argsMonitoringPort
+        , IDEMain.argsMonitoring = OpenTelemetry.monitoring
         }

ghcide/ghcide.cabal

@@ -28,13 +28,6 @@ source-repository head
   type:     git
   location: https://github.com/haskell/haskell-language-server.git
 
-flag ekg
-  description:
-    Enable EKG monitoring of the build graph and other metrics on port 8999
-
-  default:     False
-  manual:      True
-
 flag pedantic
   description: Enable -Werror
   default:     False
@@ -178,7 +171,6 @@ library
     Development.IDE.LSP.Server
     Development.IDE.Main
     Development.IDE.Main.HeapStats
-    Development.IDE.Monitoring.EKG
     Development.IDE.Monitoring.OpenTelemetry
     Development.IDE.Plugin
     Development.IDE.Plugin.Completions
@@ -218,13 +210,6 @@ library
     ghc-options:
       -Werror
 
-  if flag(ekg)
-    build-depends:
-      , ekg-core
-      , ekg-wai
-
-    cpp-options:   -DMONITORING_EKG
-
 flag test-exe
   description: Build the ghcide-test-preprocessor executable
   default:     True

ghcide/src/Development/IDE/Main.hs

@@ -65,7 +65,6 @@ import           Development.IDE.LSP.LanguageServer       (runLanguageServer,
 import qualified Development.IDE.LSP.LanguageServer       as LanguageServer
 import           Development.IDE.Main.HeapStats           (withHeapStats)
 import qualified Development.IDE.Main.HeapStats           as HeapStats
-import qualified Development.IDE.Monitoring.EKG           as EKG
 import qualified Development.IDE.Monitoring.OpenTelemetry as OpenTelemetry
 import           Development.IDE.Plugin                   (Plugin (pluginHandlers, pluginModifyDynflags, pluginRules))
 import           Development.IDE.Plugin.HLS               (asGhcIdePlugin)
@@ -259,7 +258,7 @@ defaultArguments recorder logger plugins = Arguments
                 -- the language server tests without the redirection.
                 putStr " " >> hFlush stdout
                 return newStdout
-        , argsMonitoring = OpenTelemetry.monitoring <> EKG.monitoring logger 8999
+        , argsMonitoring = OpenTelemetry.monitoring
         }