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MongoDB Exporter – Scrapes MongoDB stats and exposes them at its own /metrics endpoint for Prometheus to pull.
Discovery via ServiceMonitor – A ServiceMonitor tells Prometheus where the exporter lives; kube-prometheus-stack installs typically require the release: prometheus label for discovery.
Cluster DNS & Ports – Exporters reach MongoDB through the Service DNS/port (e.g., mongodb.mongodb.svc.cluster.local:27017) regardless of namespaces.
Auth via Secrets/URI – Connection is provided as a MongoDB URI; best practice is to source it from a Kubernetes Secret (e.g., existingSecret with a connectionURI key) rather than hardcoding credentials.
End-to-End Flow & Health Signal – Exporter → Prometheus TSDB → Grafana dashboards; the mongodb_up metric (1 = up) confirms connectivity and scraping.