diff --git a/privmsg.go b/privmsg.go
index cd93977..094fd19 100644
--- a/privmsg.go
+++ b/privmsg.go
@@ -22,7 +22,7 @@ import (
 
 // tmiMessage processes a PRIVMSG from TMI.
 func (robo *Robot) tmiMessage(ctx context.Context, send chan<- *tmi.Message, msg *tmi.Message) {
-	robo.Metrics.TMIMsgsCount.Observe(1)
+	robo.metrics.TMIMsgsCount.Observe(1)
 	ch, _ := robo.channels.Load(msg.To())
 	if ch == nil {
 		// TMI gives a WHISPER for a direct message, so this is a message to a
@@ -150,7 +150,7 @@ func (robo *Robot) tmiMessage(ctx context.Context, send chan<- *tmi.Message, msg
 }
 
 func (robo *Robot) command(ctx context.Context, log *slog.Logger, ch *channel.Channel, m *message.Received[message.User], cmd string) {
-	robo.Metrics.TMICommandCount.Observe(1)
+	robo.metrics.TMICommandCount.Observe(1)
 	var c *twitchCommand
 	var args map[string]string
 	level := "any"
@@ -188,7 +188,7 @@ func (robo *Robot) command(ctx context.Context, log *slog.Logger, ch *channel.Ch
 		Spoken:   robo.spoken,
 		Owner:    robo.owner,
 		Contact:  robo.ownerContact,
-		Metrics:  robo.Metrics,
+		Metrics:  robo.metrics,
 	}
 	inv := command.Invocation{
 		Channel: ch,
@@ -238,8 +238,8 @@ func (robo *Robot) learn(ctx context.Context, log *slog.Logger, ch *channel.Chan
 		log.ErrorContext(ctx, "failed to learn", slog.Any("err", err))
 		return
 	}
-	robo.Metrics.LearnLatency.Observe(cost.Seconds(), ch.Learn)
-	robo.Metrics.LearnedCount.Observe(1)
+	robo.metrics.LearnLatency.Observe(cost.Seconds(), ch.Learn)
+	robo.metrics.LearnedCount.Observe(1)
 	log.InfoContext(ctx, "learned", slog.Duration("cost", cost))
 }
 
@@ -262,7 +262,7 @@ func (robo *Robot) sendTMI(ctx context.Context, send chan<- *tmi.Message, msg me
 			slog.String("in", msg.To),
 			slog.String("text", msg.Text),
 		)
-		robo.Metrics.TMISendWait.Observe(d.Seconds())
+		robo.metrics.TMISendWait.Observe(d.Seconds())
 		select {
 		case <-ctx.Done():
 			return
diff --git a/robot.go b/robot.go
index 6b1708d..0481dc0 100644
--- a/robot.go
+++ b/robot.go
@@ -48,8 +48,8 @@ type Robot struct {
 	tmi *client[*tmi.Message, *tmi.Message]
 	// twitch is the Twitch API client.
 	twitch twitch.Client
-	// Metrics are a collection of custom domain specific Metrics.
-	Metrics *metrics.Metrics
+	// metrics are a collection of custom domain specific metrics.
+	metrics *metrics.Metrics
 }
 
 // client is the settings for OAuth2 and related elements.
@@ -79,7 +79,7 @@ func New(usersKey []byte, poolSize int) *Robot {
 		channels: syncmap.New[string, *channel.Channel](),
 		works:    make(chan chan func(context.Context), poolSize),
 		hashes:   func() userhash.Hasher { return userhash.New(usersKey) },
-		Metrics:  newMetrics(),
+		metrics:  newMetrics(),
 	}
 }
 
@@ -90,7 +90,7 @@ func (robo *Robot) Run(ctx context.Context, listen string) error {
 		group.Go(func() error { return robo.runTwitch(ctx, group) })
 	}
 	if listen != "" {
-		group.Go(func() error { return robo.api(ctx, listen, new(http.ServeMux), robo.Metrics.Collectors()) })
+		group.Go(func() error { return robo.api(ctx, listen, new(http.ServeMux), robo.metrics.Collectors()) })
 	}
 	err := group.Wait()
 	if err == context.Canceled {
diff --git a/tmi.go b/tmi.go
index 2832443..3a39012 100644
--- a/tmi.go
+++ b/tmi.go
@@ -105,7 +105,7 @@ func (robo *Robot) clearchat(ctx context.Context, msg *tmi.Message) {
 		slog.InfoContext(ctx, "clear all chat", slog.String("channel", msg.To()), slog.String("tag", tag))
 		for m := range ch.History.All() {
 			slog.DebugContext(ctx, "forget all chat", slog.String("channel", msg.To()), slog.String("id", m.ID))
-			robo.Metrics.ForgotCount.Observe(1)
+			robo.metrics.ForgotCount.Observe(1)
 			err := robo.brain.Forget(ctx, tag, m.ID)
 			if err != nil {
 				slog.ErrorContext(ctx, "failed to forget while clearing all chat",
@@ -129,7 +129,7 @@ func (robo *Robot) clearchat(ctx context.Context, msg *tmi.Message) {
 				continue
 			}
 			slog.DebugContext(ctx, "forget from recent trace", slog.String("channel", msg.To()), slog.String("id", id))
-			robo.Metrics.ForgotCount.Observe(1)
+			robo.metrics.ForgotCount.Observe(1)
 			if err := robo.brain.Forget(ctx, tag, id); err != nil {
 				slog.ErrorContext(ctx, "failed to forget from recent trace",
 					slog.Any("err", err),
@@ -146,7 +146,7 @@ func (robo *Robot) clearchat(ctx context.Context, msg *tmi.Message) {
 				continue
 			}
 			slog.DebugContext(ctx, "forget from user", slog.String("channel", msg.To()), slog.String("id", m.ID))
-			robo.Metrics.ForgotCount.Observe(1)
+			robo.metrics.ForgotCount.Observe(1)
 			if err := robo.brain.Forget(ctx, ch.Learn, m.ID); err != nil {
 				slog.ErrorContext(ctx, "failed to forget from user",
 					slog.Any("err", err),
@@ -172,7 +172,7 @@ func (robo *Robot) clearmsg(ctx context.Context, msg *tmi.Message) {
 	if u != robo.tmi.name {
 		// Forget a message from someone else.
 		log.InfoContext(ctx, "forget message", slog.String("tag", ch.Learn), slog.String("id", t))
-		forget(ctx, log, robo.Metrics.ForgotCount, robo.brain, ch.Learn, t)
+		forget(ctx, log, robo.metrics.ForgotCount, robo.brain, ch.Learn, t)
 		return
 	}
 	// Forget a message from the robo.
@@ -192,7 +192,7 @@ func (robo *Robot) clearmsg(ctx context.Context, msg *tmi.Message) {
 		return
 	}
 	log.InfoContext(ctx, "forget trace", slog.String("tag", ch.Send), slog.Any("spoken", tm), slog.Any("trace", trace))
-	forget(ctx, log, robo.Metrics.ForgotCount, robo.brain, ch.Send, trace...)
+	forget(ctx, log, robo.metrics.ForgotCount, robo.brain, ch.Send, trace...)
 }
 
 func forget(ctx context.Context, log *slog.Logger, forgetCount metrics.Observer, brain brain.Interface, tag string, trace ...string) {