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# Telemetry technology stack
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Various telemetry tools are included in the technology stack of this repository.
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## kube-prometheus-stack: prometheus, grafana, dashboards
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Kube-prometheus-stack contains Kubernetes manifests, Prometheus and Grafana, including preconfigured dashboards.
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### Kube-prometheus-stack Overview
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Grafana is an open-source monitoring solution that enables viusalization of metrics and logs.
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Prometheus is an open-source monitoring and alerting system which collects metrics from services and allows the metrics to be shown in Grafana.
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### Start
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Once Grafana is running it is accessible under https://cnoe.localtest.me/grafana.
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Many preconfigured dashboards can be used by klicking the menu option Dashboards.
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### Adding your own dashboards
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The application edfbuilder/kind/stacks/core/kube-prometheus.yaml is used to import new Loki dashboards.
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Examples for imported dashboards can be found in the folder edfbuilder/kind/stacks/core/kube-prometheus/dashboards.
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It is possible to add your own dashboards:
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Dashboards must be in JSON format. To add your own dashboard create a new ConfigMap in YAML format using onw of the examples as a blueprint.
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The new dashboard in JSON format has to be added as the value for data.k8s-dashboard-[...].json like in the examples.
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(It is important to use a unique name for data.k8s-dashboard-[...].json for each dashboard.)
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Currently preconfigured dashboards include several dahboards for Loki and a dashboard to showcase Nginx-Ingress metrics.
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## Loki
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Grafana Loki is a scalable open-source log aggregation system
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### Loki Overview
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The application Grafana Loki is started in edfbuilder/kind/stacks/core/loki.yaml.
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Loki is started in microservices mode and contains the components ingester, distributor, querier, and query-frontend.
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The Helm values file edfbuilder/kind/stacks/core/loki/values.yaml contains configuration values.
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## promtail
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Grafana Promtail is an agent that ships logs to a Grafan Loki instance (log-shipper)
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The application Grafana Promtail is started in edfbuilder/kind/stacks/core/promtail.yaml.
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The Helm values file edfbuilder/kind/stacks/core/promtail/values.yaml contains configuration values.
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