Enable mTLS for custom metrics

To enable Strict mTLS scraping for a component, configure the Istio TLS certificates in the corresponding ServiceMonitor:

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---
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: metrics
namespace: kyma-system
labels:
prometheus: monitoring
example: monitoring-custom-metrics
spec:
selector:
matchLabels:
k8s-app: metrics
targetLabels:
- k8s-app
endpoints:
- port: web
interval: 10s
scheme: https
tlsConfig:
caFile: /etc/prometheus/secrets/istio.default/root-cert.pem
certFile: /etc/prometheus/secrets/istio.default/cert-chain.pem
keyFile: /etc/prometheus/secrets/istio.default/key.pem
insecureSkipVerify: true # Prometheus does not support Istio security naming; skip verifying the target Pod certificate
namespaceSelector:
any: true