3 files changed, 70 insertions, 5 deletions
diff --git a/internal/event/export/ocagent/wire/metrics.go b/internal/event/export/ocagent/wire/metrics.go
index 4cfdb88bf..6cb58943c 100644
--- a/internal/event/export/ocagent/wire/metrics.go
+++ b/internal/event/export/ocagent/wire/metrics.go
@@ -71,9 +71,12 @@ type PointInt64Value struct {
 // OpenCensus service can correctly determine the underlying value type.
 // This custom MarshalJSON exists because,
 // by default *Point is JSON marshalled as:
-//     {"value": {"int64Value": 1}}
+//
+//	{"value": {"int64Value": 1}}
+//
 // but it should be marshalled as:
-//     {"int64Value": 1}
+//
+//	{"int64Value": 1}
 func (p *Point) MarshalJSON() ([]byte, error) {
 	if p == nil {
 		return []byte("null"), nil
@@ -158,9 +161,12 @@ type bucketOptionsExplicitAlias BucketOptionsExplicit
 // OpenCensus service can correctly determine the underlying value type.
 // This custom MarshalJSON exists because,
 // by default BucketOptionsExplicit is JSON marshalled as:
-//     {"bounds":[1,2,3]}
+//
+//	{"bounds":[1,2,3]}
+//
 // but it should be marshalled as:
-//     {"explicit":{"bounds":[1,2,3]}}
+//
+//	{"explicit":{"bounds":[1,2,3]}}
 func (be *BucketOptionsExplicit) MarshalJSON() ([]byte, error) {
 	return json.Marshal(&struct {
 		Explicit *bucketOptionsExplicitAlias `json:"explicit,omitempty"`
diff --git a/internal/event/export/trace.go b/internal/event/export/trace.go
index 1a99482f1..79aebbaca 100644
--- a/internal/event/export/trace.go
+++ b/internal/event/export/trace.go
@@ -90,7 +90,7 @@ func (s *SpanContext) Format(f fmt.State, r rune) {
 }
 
 func (s *Span) Start() core.Event {
-	// start never changes after construction, so we dont need to hold the mutex
+	// start never changes after construction, so we don't need to hold the mutex
 	return s.start
 }
 
diff --git a/internal/event/tag/tag.go b/internal/event/tag/tag.go
new file mode 100644
index 000000000..ff2f2ecd3
--- /dev/null
+++ b/internal/event/tag/tag.go
@@ -0,0 +1,59 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package tag provides the labels used for telemetry throughout gopls.
+package tag
+
+import (
+	"golang.org/x/tools/internal/event/keys"
+)
+
+var (
+	// create the label keys we use
+	Method        = keys.NewString("method", "")
+	StatusCode    = keys.NewString("status.code", "")
+	StatusMessage = keys.NewString("status.message", "")
+	RPCID         = keys.NewString("id", "")
+	RPCDirection  = keys.NewString("direction", "")
+	File          = keys.NewString("file", "")
+	Directory     = keys.New("directory", "")
+	URI           = keys.New("URI", "")
+	Package       = keys.NewString("package", "") // Package ID
+	PackagePath   = keys.NewString("package_path", "")
+	Query         = keys.New("query", "")
+	Snapshot      = keys.NewUInt64("snapshot", "")
+	Operation     = keys.NewString("operation", "")
+
+	Position     = keys.New("position", "")
+	Category     = keys.NewString("category", "")
+	PackageCount = keys.NewInt("packages", "")
+	Files        = keys.New("files", "")
+	Port         = keys.NewInt("port", "")
+	Type         = keys.New("type", "")
+	HoverKind    = keys.NewString("hoverkind", "")
+
+	NewServer = keys.NewString("new_server", "A new server was added")
+	EndServer = keys.NewString("end_server", "A server was shut down")
+
+	ServerID     = keys.NewString("server", "The server ID an event is related to")
+	Logfile      = keys.NewString("logfile", "")
+	DebugAddress = keys.NewString("debug_address", "")
+	GoplsPath    = keys.NewString("gopls_path", "")
+	ClientID     = keys.NewString("client_id", "")
+
+	Level = keys.NewInt("level", "The logging level")
+)
+
+var (
+	// create the stats we measure
+	Started       = keys.NewInt64("started", "Count of started RPCs.")
+	ReceivedBytes = keys.NewInt64("received_bytes", "Bytes received.")            //, unit.Bytes)
+	SentBytes     = keys.NewInt64("sent_bytes", "Bytes sent.")                    //, unit.Bytes)
+	Latency       = keys.NewFloat64("latency_ms", "Elapsed time in milliseconds") //, unit.Milliseconds)
+)
+
+const (
+	Inbound  = "in"
+	Outbound = "out"
+)