feat: add mysql metrics exporter and registrar integration

- Add mysqld_exporter build stage and binary
- Create dedicated exporter MySQL user with restricted privileges
- Configure MySQL exporter with environment-specific service naming
- Add metrics registrar for metrics collection and proxy
- Update Docker build stages to include new components

Dockerfile

@@ -1,13 +1,20 @@
 ARG MYSQL_VERSION=8
 ARG METRICS_EXPORTER_VERSION=develop
-ARG MYSQL_MANAGER_VERSION=develop
+ARG METRICS_REGISTRAR_VERSION=develop
 ARG ETCD_VERSION=3.5
+ARG GO_VERSION=1.21
 
 # Disable Percona Telemetry
 ARG PERCONA_TELEMETRY_DISABLE=1
 
-# Use metrics exporter as builder stage
+# Use metrics exporter and registrar as builder stages
 FROM ghcr.io/lumeweb/akash-metrics-exporter:${METRICS_EXPORTER_VERSION} AS metrics-exporter
+FROM ghcr.io/lumeweb/akash-metrics-registrar:${METRICS_REGISTRAR_VERSION} AS metrics-registrar
+
+# Build mysqld_exporter
+FROM golang:${GO_VERSION} AS mysqld-builder
+RUN go install github.com/prometheus/mysqld_exporter@latest
+
 FROM docker.io/bitnami/etcd:${ETCD_VERSION} as etcd
 
 FROM percona:${MYSQL_VERSION}
@@ -41,7 +48,11 @@ COPY --chown=mysql:mysql paths.sh /paths.sh
 COPY --chown=mysql:mysql lib/ /usr/local/lib/
 COPY --chown=mysql:mysql bin/mysql-backup-* /usr/local/bin/
 RUN chmod 755 /usr/local/bin/mysql-backup-*
+
+# Copy binaries from builder stages
 COPY --from=metrics-exporter /usr/bin/metrics-exporter /usr/bin/akash-metrics-exporter
+COPY --from=metrics-registrar /usr/bin/metrics-registrar /usr/bin/akash-metrics-registrar
+COPY --from=mysqld-builder /go/bin/mysqld_exporter /usr/bin/mysqld_exporter
 COPY --from=etcd /opt/bitnami/etcd/bin/etcdctl /usr/bin/etcdctl
 COPY ./docker-entrypoint-initdb.d /docker-entrypoint-initdb.d
 
@@ -57,4 +68,4 @@ USER root
 VOLUME ["/var/lib/data"]
 
 ENTRYPOINT ["/entrypoint.sh"]
-CMD ["mysqld"]
+CMD ["mysqld"]

docker-entrypoint-initdb.d/04-create-exporter-user.sql

@@ -0,0 +1,2 @@
+CREATE USER IF NOT EXISTS 'exporter'@'localhost' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}' WITH MAX_USER_CONNECTIONS 3;
+GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'exporter'@'localhost';

entrypoint.sh

@@ -75,8 +75,24 @@ start_services() {
         start_cron
     fi
 
-    # Start akash-metrics-exporter
+    # Set exporter password same as root
+    export MYSQL_EXPORTER_PASSWORD="${MYSQL_ROOT_PASSWORD}"
+
+    # Start MySQL exporter (internal only)
+    mysqld_exporter \
+        --web.listen-address=":9104" \
+        --config.my-cnf=/etc/my.cnf.d/exporter.cnf &
+
+    # Start Akash metrics exporter (env vars already set)
     akash-metrics-exporter &
+    # Start Akash metrics registrar
+    akash-metrics-registrar \
+        --target-host="localhost" \
+        --target-port=9104 \
+        --target-path="/metrics" \
+        --proxy-port=9090 \
+        --exporter-type="mysql" \
+        --metrics-password="${METRICS_PASSWORD}" &
 }
 
 # Stop services before exit

lib/mysql-config.sh

@@ -382,6 +382,7 @@ EOF
 
     # Configure backup streaming
     configure_backup_streaming
+
     return 0
 }