all: make prometheus metrics greppable (#386)

Co-authored-by: Sourcegraph Bot <campaigns@sourcegraph.com>

buildserver/deps.go

@@ -529,16 +529,12 @@ var NewDepRepoVFS = func(ctx context.Context, cloneURL *url.URL, rev string, zip
 }
 
 var depZipFetch = prometheus.NewCounter(prometheus.CounterOpts{
-	Namespace: "golangserver",
-	Subsystem: "vfs",
-	Name:      "dep_zip_fetch_total",
-	Help:      "Total number of zip URL fetches by NewDepRepoVFS.",
+	Name: "golangserver_vfs_dep_zip_fetch_total",
+	Help: "Total number of zip URL fetches by NewDepRepoVFS.",
 })
 var depZipFetchFailed = prometheus.NewCounter(prometheus.CounterOpts{
-	Namespace: "golangserver",
-	Subsystem: "vfs",
-	Name:      "dep_zip_fetch_failed_total",
-	Help:      "Total number of zip URL fetches by NewDepRepoVFS that failed.",
+	Name: "golangserver_vfs_dep_zip_fetch_failed_total",
+	Help: "Total number of zip URL fetches by NewDepRepoVFS that failed.",
 })
 
 func init() {

buildserver/vfs.go

@@ -51,16 +51,12 @@ var RemoteFS = func(ctx context.Context, initializeParams lspext.InitializeParam
 }
 
 var zipFetch = prometheus.NewCounter(prometheus.CounterOpts{
-	Namespace: "golangserver",
-	Subsystem: "vfs",
-	Name:      "zip_fetch_total",
-	Help:      "Total number of times a zip archive was fetched for the currently-viewed repo.",
+	Name: "golangserver_vfs_zip_fetch_total",
+	Help: "Total number of times a zip archive was fetched for the currently-viewed repo.",
 })
 var zipFetchFailed = prometheus.NewCounter(prometheus.CounterOpts{
-	Namespace: "golangserver",
-	Subsystem: "vfs",
-	Name:      "zip_fetch_failed_total",
-	Help:      "Total number of times fetching a zip archive for the currently-viewed repo failed.",
+	Name: "golangserver_vfs_zip_fetch_failed_total",
+	Help: "Total number of times fetching a zip archive for the currently-viewed repo failed.",
 })
 
 func init() {

langserver/cache.go

@@ -24,28 +24,20 @@ var (
 	cacheID int64
 
 	typecheckCacheSize = prometheus.NewGauge(prometheus.GaugeOpts{
-		Namespace: "golangserver",
-		Subsystem: "typecheck",
-		Name:      "cache_size",
-		Help:      "Number of items in the typecheck cache",
+		Name: "golangserver_typecheck_cache_size",
+		Help: "Number of items in the typecheck cache",
 	})
 	typecheckCacheTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "golangserver",
-		Subsystem: "typecheck",
-		Name:      "cache_request_total",
-		Help:      "Count of requests to cache.",
+		Name: "golangserver_typecheck_cache_request_total",
+		Help: "Count of requests to cache.",
 	}, []string{"type"})
 	symbolCacheSize = prometheus.NewGauge(prometheus.GaugeOpts{
-		Namespace: "golangserver",
-		Subsystem: "symbol",
-		Name:      "cache_size",
-		Help:      "Number of items in the symbol cache",
+		Name: "golangserver_symbol_cache_size",
+		Help: "Number of items in the symbol cache",
 	})
 	symbolCacheTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: "golangserver",
-		Subsystem: "symbol",
-		Name:      "cache_request_total",
-		Help:      "Count of requests to cache.",
+		Name: "golangserver_symbol_cache_request_total",
+		Help: "Count of requests to cache.",
 	}, []string{"type"})
 )
 

langserver/internal/gocode/suggest/candidate.go

@@ -75,12 +75,12 @@ func classifyObject(obj types.Object) string {
 }
 
 type candidateCollector struct {
-	exact      []types.Object
-	badcase    []types.Object
-	localpkg   *types.Package
-	partial    string
-	filter     objectFilter
-	builtin    bool
+	exact    []types.Object
+	badcase  []types.Object
+	localpkg *types.Package
+	partial  string
+	filter   objectFilter
+	builtin  bool
 }
 
 func (b *candidateCollector) getCandidates() []Candidate {

langserver/internal/refs/refs.go

@@ -316,12 +316,12 @@ type dereferencable interface {
 func dereferenceType(otyp types.Type) types.Type {
 	for {
 		switch typ := otyp.(type) {
-			case *types.Map:
-				return otyp
-			case dereferencable:
-				otyp = typ.Elem()
-			default:
-				return otyp
+		case *types.Map:
+			return otyp
+		case dereferencable:
+			otyp = typ.Elem()
+		default:
+			return otyp
 		}
 	}
 }

main.go

@@ -56,10 +56,8 @@ var (
 	lintTool           = flag.String("lint-tool", "none", "which tool is used to linting. Supported: none and golint. Can be overridden by InitializationOptions.")
 
 	openGauge = prometheus.NewGauge(prometheus.GaugeOpts{
-		Namespace: "golangserver",
-		Subsystem: "build",
-		Name:      "open_connections",
-		Help:      "Number of open connections to the language server.",
+		Name: "golangserver_build_open_connections",
+		Help: "Number of open connections to the language server.",
 	})
 )
 

vfsutil/cache.go

@@ -64,10 +64,8 @@ func zipNewFileReader(f *os.File) (*zip.Reader, error) {
 }
 
 var cachedFileEvict = prometheus.NewCounter(prometheus.CounterOpts{
-	Namespace: "golangserver",
-	Subsystem: "vfs",
-	Name:      "cached_file_evict",
-	Help:      "Total number of evictions to cachedFetch archives.",
+	Name: "golangserver_vfs_cached_file_evict",
+	Help: "Total number of evictions to cachedFetch archives.",
 })
 
 func init() {

vfsutil/github_archive.go

@@ -22,16 +22,12 @@ func NewGitHubRepoVFS(ctx context.Context, repo, rev string) (*ArchiveFS, error)
 var githubRepoRx = regexp.MustCompile(`^github\.com/[\w.-]{1,100}/[\w.-]{1,100}$`)
 
 var ghFetch = prometheus.NewCounter(prometheus.CounterOpts{
-	Namespace: "golangserver",
-	Subsystem: "vfs",
-	Name:      "github_fetch_total",
-	Help:      "Total number of fetches by GitHubRepoVFS.",
+	Name: "golangserver_vfs_github_fetch_total",
+	Help: "Total number of fetches by GitHubRepoVFS.",
 })
 var ghFetchFailed = prometheus.NewCounter(prometheus.CounterOpts{
-	Namespace: "golangserver",
-	Subsystem: "vfs",
-	Name:      "github_fetch_failed_total",
-	Help:      "Total number of fetches by GitHubRepoVFS that failed.",
+	Name: "golangserver_vfs_github_fetch_failed_total",
+	Help: "Total number of fetches by GitHubRepoVFS that failed.",
 })
 
 func init() {