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prometheus-operator
Prometheus Operator creates/configures/manages Prometheus clusters atop Kubernetes
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Not sure if monitoring a specific Pod is the best idea. But assuming your Pod is provisioned through a Deployment and you already have a Service pointing to it for Ingress purposes, I'd suggest to deploy a ServiceMonitor (see https://github.com/prometheus-operator/prometheus-operator/blob/main/example/user-guides/getting-started/example-app-service-monitor.yaml) pointing to your Service, so Prometheus can pick it up.
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Hence, a higher number means a more popular project.