feat: add opentelemetry collector

docker/opentelemetry/collector/compose.yaml

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+services:
+  collector:
+    image: otel/opentelemetry-collector-contrib:latest
+    ports:
+      - "4317:4317"  # OTLP gRPC
+      - "55681:55681"  # OTLP HTTP
+      - "8888:8888"  # Prometheus metrics endpoint
+    volumes:
+      - ./config.yaml:/etc/otel/config.yaml
+    command: ["--config", "/etc/otel/config.yaml"]

docker/opentelemetry/collector/config.yaml

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+receivers:
+  mysql:
+    endpoint: "mysql-primary.eigen-erp-test.svc.cluster.local:3306" # Replace with your MySQL host and port
+    username: "root"           # The dedicated MySQL user
+    password: "eigen3m!" # Use environment variable for password for security
+    collection_interval: 10s   # How frequently to collect metrics (e.g., 10 seconds)
+    initial_delay: 1s          # Initial delay before starting collection
+    # Optional: Configure statement events for detailed query metrics
+    statement_events:
+      digest_text_limit: 120
+      time_limit: 24h
+      limit: 250
+
+processors:
+  # metricstransform:
+  #   transforms:
+  #     - include: mysql.* # Include all MySQL metrics
+  #       match_type: regexp
+  #       action: insert
+  #       operations:
+  #         - action: add_label
+  #           new_label: cluster
+  #           new_value: "internal.eigen.local"
+  batch:
+    send_batch_size: 10000
+    timeout: 10s
+
+exporters:
+  # otlp:
+  #   endpoint: "172.10.10.6:30641" # Or your OTLP backend endpoint (e.g., a tracing/metrics backend like Jaeger, Prometheus, or a vendor's OTLP endpoint)
+  #   tls:
+  #     insecure: true # Set to false and configure proper TLS for production
+  prometheusremotewrite:
+    endpoint: "http://172.10.10.6:30291/api/v1/receive" # Or your Prometheus remote write endpoint
+    external_labels:
+      cluster: internal.eigen.local
+
+service:
+  pipelines:
+    metrics:
+      receivers: [mysql]
+      processors: [batch]
+      exporters: [prometheusremotewrite]
+    # If you also want to collect logs or traces from other sources, you'd add
+    # log and trace pipelines here as well.