Connect redis exporter and prometheus operator - kubernetes

Question

I have a Redis cluster and Redis-exporter in two separate deployments in the same namespace of a Kubernetes cluster. I am using Prometheus operator to monitor the cluster, but I can not find a way to set up the exporter and the operator. I have set up a service targeting the Redis exporter(check below) and a ServiceMonitor(also below). If I port forward to the Redis exporter service I can see the metrics. Also, the Redis exporter logs do not show issues.
apiVersion: apps/v1
kind: Deployment
metadata:
namespace: foo
name: redis-exporter
labels:
app: redis-exporter
spec:
replicas: 1
selector:
matchLabels:
app: redis-exporter
template:
metadata:
annotations:
prometheus.io/scrape: "true"
prometheus.io/port: "9121"
labels:
app: redis-exporter
spec:
containers:
- name: redis-exporter
image: oliver006/redis_exporter:latest
resources:
requests:
cpu: 100m
memory: 100Mi
env:
- name: REDIS_ADDR
value: redis-cluster.foo.svc:6379
ports:
- containerPort: 9121
My service and servicemonitor
kind: Service
metadata:
name: redis-external-exporter
namespace: foo
labels:
app: redis
k8s-app: redis-ext
annotations:
prometheus.io/scrape: 'true'
prometheus.io/port: "9121"
spec:
ports:
- name: redis-ext
port: 9121
protocol: TCP
targetPort: 9121
selector:
app: redis-exporter
---
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: redis-external-exporter
namespace: bi-infra
labels:
app: redis-external-exporter
k8s-app: redis-monitor
spec:
jobLabel: app
selector:
matchLabels:
app: redis-ext
namespaceSelector:
matchNames:
- foo
endpoints:
- port: redis-ext
interval: 30s
honorLabels: true
If I switch to a sidecar Redis exporter next to the Redis cluster all is working properly. Has anyone faced such issue?

Answer 1

I was missing spec.endpoints.path on the ServiceMonitor
Here is an example manifest from adding new scraping targets and troubleshooting tutorial.
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: monitoring-pili
namespace: monitoring
labels:
app: pili-service-monitor
spec:
selector:
matchLabels:
# Target app service
app: pili
endpoints:
- interval: 15s
path: /metrics <---
port: uwsgi
namespaceSelector:
matchNames:
- default