Pgbouncer exporter in compute image (#10503)

https://github.com/neondatabase/cloud/issues/19081
Include pgbouncer_exporter in compute image and run it at port 9127

compute/compute-node.Dockerfile

@@ -1266,11 +1266,12 @@ RUN set -e \
 
 #########################################################################################
 #
-# Layers "postgres-exporter" and "sql-exporter"
+# Layers "postgres-exporter", "pgbouncer-exporter", and "sql-exporter"
 #
 #########################################################################################
 
 FROM quay.io/prometheuscommunity/postgres-exporter:v0.16.0 AS postgres-exporter
+FROM quay.io/prometheuscommunity/pgbouncer-exporter:v0.10.2 AS pgbouncer-exporter
 
 # Keep the version the same as in build-tools.Dockerfile and
 # test_runner/regress/test_compute_metrics.py.
@@ -1402,6 +1403,7 @@ RUN mkdir -p /etc/local_proxy && chown postgres:postgres /etc/local_proxy
 
 # Metrics exporter binaries and  configuration files
 COPY --from=postgres-exporter /bin/postgres_exporter /bin/postgres_exporter
+COPY --from=pgbouncer-exporter /bin/pgbouncer_exporter /bin/pgbouncer_exporter
 COPY --from=sql-exporter      /bin/sql_exporter      /bin/sql_exporter
 
 COPY --chown=postgres compute/etc/postgres_exporter.yml /etc/postgres_exporter.yml

compute/etc/pgbouncer.ini

@@ -19,6 +19,8 @@ max_prepared_statements=0
 admin_users=postgres
 unix_socket_dir=/tmp/
 unix_socket_mode=0777
+; required for pgbouncer_exporter
+ignore_startup_parameters=extra_float_digits
 
 ;; Disable connection logging. It produces a lot of logs that no one looks at,
 ;; and we can get similar log entries from the proxy too. We had incidents in

compute/vm-image-spec-bookworm.yaml

@@ -27,6 +27,10 @@ commands:
     user: nobody
     sysvInitAction: respawn
     shell: 'DATA_SOURCE_NAME="user=cloud_admin sslmode=disable dbname=postgres application_name=postgres-exporter" /bin/postgres_exporter --config.file=/etc/postgres_exporter.yml'
+  - name: pgbouncer-exporter
+    user: postgres
+    sysvInitAction: respawn
+    shell: '/bin/pgbouncer_exporter --pgBouncer.connectionString="postgres:///pgbouncer?host=/tmp&port=6432&dbname=pgbouncer&user=pgbouncer"'
   - name: sql-exporter
     user: nobody
     sysvInitAction: respawn

compute/vm-image-spec-bullseye.yaml

@@ -27,6 +27,10 @@ commands:
     user: nobody
     sysvInitAction: respawn
     shell: 'DATA_SOURCE_NAME="user=cloud_admin sslmode=disable dbname=postgres application_name=postgres-exporter" /bin/postgres_exporter --config.file=/etc/postgres_exporter.yml'
+  - name: pgbouncer-exporter
+    user: postgres
+    sysvInitAction: respawn
+    shell: '/bin/pgbouncer_exporter --pgBouncer.connectionString="postgres:///pgbouncer?host=/tmp&port=6432&dbname=pgbouncer&user=pgbouncer"'
   - name: sql-exporter
     user: nobody
     sysvInitAction: respawn