diff --git a/example/otel/README.md b/example/otel/README.md
index 5d1431e..5af11bc 100644
--- a/example/otel/README.md
+++ b/example/otel/README.md
@@ -17,7 +17,6 @@ cd example/otel
 **Step 2**. Start the services using Docker:
 
 ```shell
-docker-compose pull
 docker-compose up -d
 ```
 
@@ -27,16 +26,10 @@ docker-compose up -d
 docker-compose logs uptrace
 ```
 
-**Step 4**. Run the Redis client example:
+**Step 4**. Run the Redis client example and Follow the link to view the trace:
 
 ```shell
-UPTRACE_DSN=http://project2_secret_token@localhost:14317/2 go run client.go
-```
-
-**Step 5**. Follow the link from the CLI to view the trace:
-
-```shell
-UPTRACE_DSN=http://project2_secret_token@localhost:14317/2 go run client.go
+go run client.go
 trace: http://localhost:14318/traces/ee029d8782242c8ed38b16d961093b35
 ```
 
diff --git a/example/otel/client.go b/example/otel/client.go
index 97cec2c..9e087a9 100644
--- a/example/otel/client.go
+++ b/example/otel/client.go
@@ -22,7 +22,7 @@ func main() {
 
 	uptrace.ConfigureOpentelemetry(
 		// copy your project DSN here or use UPTRACE_DSN env var
-		// uptrace.WithDSN("http://project2_secret_token@localhost:14317/2"),
+		uptrace.WithDSN("http://project2_secret_token@localhost:14317/2"),
 
 		uptrace.WithServiceName("myservice"),
 		uptrace.WithServiceVersion("v1.0.0"),
diff --git a/example/otel/docker-compose.yml b/example/otel/docker-compose.yml
index 786f6e1..e607dd0 100644
--- a/example/otel/docker-compose.yml
+++ b/example/otel/docker-compose.yml
@@ -18,7 +18,7 @@ services:
       - '9000:9000'
 
   uptrace:
-    image: 'uptrace/uptrace:1.2.0'
+    image: 'uptrace/uptrace:1.2.2'
     #image: 'uptrace/uptrace-dev:latest'
     restart: on-failure
     volumes:
@@ -74,8 +74,5 @@ services:
 
 volumes:
   uptrace_data:
-    driver: local
   ch_data:
-    driver: local
   alertmanager_data:
-    driver: local
diff --git a/extra/redisotel/config.go b/extra/redisotel/config.go
index 7c29e0c..5b558aa 100644
--- a/extra/redisotel/config.go
+++ b/extra/redisotel/config.go
@@ -5,14 +5,15 @@ import (
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/metric/global"
-	semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
 	"go.opentelemetry.io/otel/trace"
 )
 
 type config struct {
 	// Common options.
 
-	attrs []attribute.KeyValue
+	dbSystem string
+	attrs    []attribute.KeyValue
 
 	// Tracing options.
 
@@ -51,19 +52,29 @@ func (fn option) metrics() {}
 
 func newConfig(opts ...baseOption) *config {
 	conf := &config{
-		tp: otel.GetTracerProvider(),
-		mp: global.MeterProvider(),
-		attrs: []attribute.KeyValue{
-			semconv.DBSystemRedis,
-		},
+		dbSystem: "redis",
+		attrs:    []attribute.KeyValue{},
+
+		tp:            otel.GetTracerProvider(),
+		mp:            global.MeterProvider(),
 		dbStmtEnabled: true,
 	}
+
 	for _, opt := range opts {
 		opt.apply(conf)
 	}
+
+	conf.attrs = append(conf.attrs, semconv.DBSystemKey.String(conf.dbSystem))
+
 	return conf
 }
 
+func WithDBSystem(dbSystem string) Option {
+	return option(func(conf *config) {
+		conf.dbSystem = dbSystem
+	})
+}
+
 // WithAttributes specifies additional attributes to be added to the span.
 func WithAttributes(attrs ...attribute.KeyValue) Option {
 	return option(func(conf *config) {
diff --git a/extra/redisotel/metrics.go b/extra/redisotel/metrics.go
index 6d41d32..4912853 100644
--- a/extra/redisotel/metrics.go
+++ b/extra/redisotel/metrics.go
@@ -82,6 +82,30 @@ func reportPoolStats(rdb *redis.Client, conf *config) error {
 	idleAttrs := append(labels, attribute.String("state", "idle"))
 	usedAttrs := append(labels, attribute.String("state", "used"))
 
+	idleMax, err := conf.meter.AsyncInt64().UpDownCounter(
+		"db.client.connections.idle.max",
+		instrument.WithDescription("The maximum number of idle open connections allowed"),
+	)
+	if err != nil {
+		return err
+	}
+
+	idleMin, err := conf.meter.AsyncInt64().UpDownCounter(
+		"db.client.connections.idle.min",
+		instrument.WithDescription("The minimum number of idle open connections allowed"),
+	)
+	if err != nil {
+		return err
+	}
+
+	connsMax, err := conf.meter.AsyncInt64().UpDownCounter(
+		"db.client.connections.max",
+		instrument.WithDescription("The maximum number of open connections allowed"),
+	)
+	if err != nil {
+		return err
+	}
+
 	usage, err := conf.meter.AsyncInt64().UpDownCounter(
 		"db.client.connections.usage",
 		instrument.WithDescription("The number of connections that are currently in state described by the state attribute"),
@@ -98,14 +122,22 @@ func reportPoolStats(rdb *redis.Client, conf *config) error {
 		return err
 	}
 
+	redisConf := rdb.Options()
 	return conf.meter.RegisterCallback(
 		[]instrument.Asynchronous{
+			idleMax,
+			idleMin,
+			connsMax,
 			usage,
 			timeouts,
 		},
 		func(ctx context.Context) {
 			stats := rdb.PoolStats()
 
+			idleMax.Observe(ctx, int64(redisConf.MinIdleConns))
+			idleMin.Observe(ctx, int64(redisConf.MaxIdleConns))
+			connsMax.Observe(ctx, int64(redisConf.PoolSize))
+
 			usage.Observe(ctx, int64(stats.IdleConns), idleAttrs...)
 			usage.Observe(ctx, int64(stats.TotalConns-stats.IdleConns), usedAttrs...)