refactor: move otel-metrics example to separate module

Author: ofekshenawa

example/otel-metrics/README.md

@@ -0,0 +1,67 @@
+# OpenTelemetry Metrics Example
+
+This example demonstrates how to enable OpenTelemetry metrics for Redis operations using the `extra/redisotel-native` package.
+
+## Features
+
+- ✅ OTLP exporter configuration
+- ✅ Periodic metric export (every 10 seconds)
+- ✅ Concurrent Redis operations
+- ✅ Automatic metric collection for:
+  - Operation duration
+  - Connection metrics
+  - Error tracking
+
+## Prerequisites
+
+- Go 1.23.0 or later
+- Redis server running on `localhost:6379`
+- OTLP collector running on `localhost:4317` (optional)
+
+## Running the Example
+
+```bash
+# Start Redis (if not already running)
+redis-server
+
+# Optional: Start OTLP collector
+# See: https://opentelemetry.io/docs/collector/
+
+# Run the example
+go run main.go
+```
+
+## What It Does
+
+1. Creates an OTLP exporter that sends metrics to a collector
+2. Sets up a meter provider with periodic export (every 10 seconds)
+3. Initializes Redis client with OTel instrumentation
+4. Executes concurrent Redis operations (SET commands)
+5. Waits for metrics to be exported
+
+## Metrics Collected
+
+The example automatically collects:
+
+- **db.client.operation.duration** - Operation latency histogram
+- **db.client.connection.create_time** - Connection creation time
+- **db.client.connection.count** - Active connection count
+- **db.client.errors** - Error counter with error type classification
+
+## Configuration
+
+To use with a production OTLP collector:
+
+```go
+exporter, err := otlpmetricgrpc.New(ctx,
+    otlpmetricgrpc.WithEndpoint("your-collector:4317"),
+    otlpmetricgrpc.WithTLSCredentials(credentials.NewClientTLSFromCert(certPool, "")),
+)
+```
+
+## See Also
+
+- [OpenTelemetry Go SDK](https://opentelemetry.io/docs/languages/go/)
+- [OTLP Exporter Documentation](https://opentelemetry.io/docs/specs/otlp/)
+- [Redis OTel Native Package](../../extra/redisotel-native/)
+

example/otel-metrics/go.mod

@@ -0,0 +1,39 @@
+module github.com/redis/go-redis/example/otel-metrics
+
+go 1.23.0
+
+toolchain go1.24.2
+
+replace github.com/redis/go-redis/v9 => ../..
+
+replace github.com/redis/go-redis/extra/redisotel-native/v9 => ../../extra/redisotel-native
+
+require (
+	github.com/redis/go-redis/extra/redisotel-native/v9 v9.0.0-00010101000000-000000000000
+	github.com/redis/go-redis/v9 v9.7.0
+	go.opentelemetry.io/otel v1.38.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.38.0
+	go.opentelemetry.io/otel/sdk/metric v1.38.0
+)
+
+require (
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/otel/metric v1.38.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.38.0 // indirect
+	go.opentelemetry.io/otel/trace v1.38.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.7.1 // indirect
+	golang.org/x/net v0.43.0 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20250825161204-c5933d9347a5 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250825161204-c5933d9347a5 // indirect
+	google.golang.org/grpc v1.75.0 // indirect
+	google.golang.org/protobuf v1.36.8 // indirect
+)

example/otel-metrics/go.sum

@@ -0,0 +1,63 @@
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