kubernetes ServiceMonitor added but no targets discovered (0/0 up) - kubernetes

Question

I am trying to expose some custom metrics of a kubernetes application at prometheus.
I successfully deploy deploy my app at kubernetes. The ServiceMonitor is also added but no targets are discovered (0/0 up) .
The application is an nginx server with the relevant nginx-prometheus-exporter sidecar.
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-example-v3
labels:
app: nginx-example-v3
spec:
selector:
matchLabels:
app: nginx-example-v3
template:
metadata:
labels:
app: nginx-example-v3
spec:
containers:
- name: nginx
image: nginx
resources:
limits:
memory: "128Mi"
cpu: "100m"
ports:
- name: http
containerPort: 8080
volumeMounts:
- name: "config"
mountPath: "/etc/nginx/nginx.conf"
subPath: "nginx.conf"
- name: exporter
image: nginx/nginx-prometheus-exporter:0.8.0
ports:
- containerPort: 9113
volumes:
- name: "config"
configMap:
name: "nginx-example-v2-config"
---
apiVersion: v1
kind: Service
metadata:
labels:
name: nginx-example-v3
name: nginx-example-v3
spec:
type: LoadBalancer
selector:
app: nginx-example-v3
ports:
- name: http
port: 8080
targetPort: 8080
- name: http-exporter
port: 9113
targetPort: 9113
After that i can see the nginx custom metrics exposed at the /metrics API:
Then i apply the monitoring service:
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: nginx-example-v3
spec:
endpoints:
- bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
interval: 15s
port: web
selector:
matchLabels:
app: nginx-example-v3
i can see that the service is successfully added at prometheus "Service Discovery" section:
BUT no targets are discovered (0/0 up) on behalf of prometheus
What i am missing???
Any help is really apreciated since i have been stuck on this many days!
Thank you very much in advance. :-)
Replies
#efotopoulou

Answer 1

I slightly changed the service manifest and i am able to get the metrics now.
sorry for the new discussion. i hope my manifests help other persons to configure their services.
This is the updated manifest.
:-)
apiVersion: v1
kind: Service
metadata:
labels:
app: nginx-example-v3
name: nginx-example-v3
spec:
type: LoadBalancer
selector:
app: nginx-example-v3
ports:
- name: http
port: 8080
targetPort: 8080
- name: web
port: 9113
targetPort: 9113