it’s ok with this config :
...
pxc:
annotations:
prometheus.io/port: "9104"
prometheus.io/scrape: "true"
...
sidecars:
- name: mysqld-exporter
image: prom/mysqld-exporter
imagePullPolicy: IfNotPresent
env:
...
- name: DATA_SOURCE_NAME
value: "exporter:pass@(127.0.0.1:3306)/"
args:
- "--web.listen-address=0.0.0.0:9104"