diff --git a/gopls/internal/regtest/misc/debugserver_test.go b/gopls/internal/regtest/misc/debugserver_test.go
index 88cfded908..c0df87070c 100644
--- a/gopls/internal/regtest/misc/debugserver_test.go
+++ b/gopls/internal/regtest/misc/debugserver_test.go
@@ -1,6 +1,7 @@
 // Copyright 2021 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 misc
 
 import (
diff --git a/internal/event/export/prometheus/prometheus.go b/internal/event/export/prometheus/prometheus.go
index 847babcb89..0281f60a35 100644
--- a/internal/event/export/prometheus/prometheus.go
+++ b/internal/event/export/prometheus/prometheus.go
@@ -27,13 +27,13 @@ type Exporter struct {
 	metrics []metric.Data
 }
 
-func (e *Exporter) ProcessEvent(ctx context.Context, ev core.Event, ln label.Map) context.Context {
+func (e *Exporter) ProcessEvent(ctx context.Context, ev core.Event, lm label.Map) context.Context {
 	if !event.IsMetric(ev) {
 		return ctx
 	}
 	e.mu.Lock()
 	defer e.mu.Unlock()
-	metrics := metric.Entries.Get(ln).([]metric.Data)
+	metrics := metric.Entries.Get(lm).([]metric.Data)
 	for _, data := range metrics {
 		name := data.Handle()
 		// We keep the metrics in name sorted order so the page is stable and easy
diff --git a/internal/lsp/debug/serve.go b/internal/lsp/debug/serve.go
index 58e59b5f2a..d7dd5445d2 100644
--- a/internal/lsp/debug/serve.go
+++ b/internal/lsp/debug/serve.go
@@ -20,6 +20,7 @@ import (
 	"path/filepath"
 	"runtime"
 	rpprof "runtime/pprof"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -76,6 +77,46 @@ type State struct {
 	mu      sync.Mutex
 	clients []*Client
 	servers []*Server
+
+	// bugs maps bug description -> formatted event
+	bugs map[string]string
+}
+
+func Bug(ctx context.Context, desc string) {
+	labels := [3]label.Label{
+		tag.Bug.Of(desc),
+	}
+	_, file, line, ok := runtime.Caller(1)
+	if ok {
+		labels[1] = tag.Callsite.Of(fmt.Sprintf("%s:%d", file, line))
+	}
+	core.Export(ctx, core.MakeEvent(labels, nil))
+}
+
+type bug struct {
+	Description, Event string
+}
+
+func (st *State) Bugs() []bug {
+	st.mu.Lock()
+	defer st.mu.Unlock()
+	var bugs []bug
+	for k, v := range st.bugs {
+		bugs = append(bugs, bug{k, v})
+	}
+	sort.Slice(bugs, func(i, j int) bool {
+		return bugs[i].Description < bugs[j].Description
+	})
+	return bugs
+}
+
+func (st *State) recordBug(description, event string) {
+	st.mu.Lock()
+	defer st.mu.Unlock()
+	if st.bugs == nil {
+		st.bugs = make(map[string]string)
+	}
+	st.bugs[description] = event
 }
 
 // Caches returns the set of Cache objects currently being served.
@@ -338,7 +379,7 @@ func (i *Instance) AddService(s protocol.Server, session *cache.Session) {
 	stdlog.Printf("unable to find a Client to add the protocol.Server to")
 }
 
-func getMemory(r *http.Request) interface{} {
+func getMemory(_ *http.Request) interface{} {
 	var m runtime.MemStats
 	runtime.ReadMemStats(&m)
 	return m
@@ -636,6 +677,9 @@ func makeInstanceExporter(i *Instance) event.Exporter {
 				}
 			}
 		}
+		if b := tag.Bug.Get(ev); b != "" {
+			i.State.recordBug(b, fmt.Sprintf("%v", ev))
+		}
 		return ctx
 	}
 	// StdTrace must be above export.Spans below (by convention, export
@@ -766,6 +810,8 @@ var MainTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
 <ul>{{range .State.Clients}}<li>{{template "clientlink" .Session.ID}}</li>{{end}}</ul>
 <h2>Servers</h2>
 <ul>{{range .State.Servers}}<li>{{template "serverlink" .ID}}</li>{{end}}</ul>
+<h2>Known bugs encountered</h2>
+<dl>{{range .State.Bugs}}<dt>{{.Description}}</dt><dd>{{.Event}}</dd>{{end}}</dl>
 {{end}}
 `))
 
diff --git a/internal/lsp/debug/tag/tag.go b/internal/lsp/debug/tag/tag.go
index ff2f2ecd38..1d00038f0a 100644
--- a/internal/lsp/debug/tag/tag.go
+++ b/internal/lsp/debug/tag/tag.go
@@ -43,6 +43,10 @@ var (
 	ClientID     = keys.NewString("client_id", "")
 
 	Level = keys.NewInt("level", "The logging level")
+
+	// Bug tracks occurrences of known bugs in the server.
+	Bug      = keys.NewString("bug", "A bug has occurred")
+	Callsite = keys.NewString("callsite", "gopls function call site")
 )
 
 var (