add: Add grafana-agent chart

charts/grafana-agent/Chart.yaml

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+---
+apiVersion: v2
+name: grafana-agent
+version: v0.0.1
+description: grafana-agent Chart for Grafana Labs Kubernetes integration. https://grafana.com/docs/grafana-cloud/kubernetes/integration-kubernetes/
+type: application
+home: https://github.com/aoshimash/homelab-helm-charts
+sources:
+  - https://grafana.com/docs/grafana-cloud/kubernetes/integration-kubernetes/
+dependencies:
+  - name: kube-state-metrics
+    version: 4.7.0
+    repository: https://prometheus-community.github.io/helm-charts

charts/grafana-agent/README.md

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+# grafana-agent
+
+grafana-agent Chart for Grafana Labs Kubernetes integration.
+
+## Values
+
+| Key | Type | Default | Description |
+|---|---|---|---|
+| kube-state-metrics.imag.tag | string | v2.4.1 | kube-state-metrics chart version |
+| cluster_name | string | mycluster | Cluster name |
+| container_runtime | string | cri | Cluster container runtime (which "cri" or "docker") |
+| image.tag | string | v0.24.0 | `grafana/agent` image tag |
+| prometheus.scrape_interval | string | 60s | How often should the metrics be collected |
+| prometheus.remote_write.url | string | nil | URL to send Prometheus metrics to Grafana Cloud |
+| prometheus.remote_write.basic_auth.username | string | nil | Grafana Cloud Prometheus username |
+| prometheus.remote_write.basic_auth.password | string | nil | Grafana Cloud Prometheus password |
+| logs.sync_period | string | 10s | Period to resync directories being watched and files being tailed to discover |
+| logs.client.url | string | nil | URL to send Loki to Grafana Cloud |
+| logs.client.basic_auth.username | string | nil | Grafana Cloud Loki username |
+| logs.client.basic_auth.password | string | nil | Grafana Cloud Loki password |
+
+## Reference
+
+- [Grafana Cloud Kubernetes Integration](https://grafana.com/docs/grafana-cloud/kubernetes/integration-kubernetes/)
+- [kube-state-metrics](https://artifacthub.io/packages/helm/prometheus-community/kube-state-metrics)

charts/grafana-agent/templates/_helpers.tpl

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+{{- define "grafana-agent.metrics.serviceAccount.name" -}}
+{{- printf "grafana-agent" -}}
+{{- end -}}
+
+{{- define "grafana-agent.metrics.clusterRole.name" -}}
+{{- printf "grafana-agent" -}}
+{{- end -}}
+
+{{- define "grafana-agent.metrics.clusterRoleBinding.name" -}}
+{{- printf "grafana-agent" -}}
+{{- end -}}
+
+{{- define "grafana-agent.metrics.service.name" -}}
+{{- printf "grafana-agent" -}}
+{{- end -}}
+
+{{- define "grafana-agent.metrics.statefulSet.name" -}}
+{{- printf "grafana-agent" -}}
+{{- end -}}
+
+{{- define "grafana-agent.metrics.configMap.name" -}}
+{{- printf "grafana-agent" -}}
+{{- end -}}
+
+{{- define "grafana-agent.logs.serviceAccount.name" -}}
+{{- printf "grafana-agent-logs" -}}
+{{- end -}}
+
+{{- define "grafana-agent.logs.clusterRole.name" -}}
+{{- printf "grafana-agent-logs" -}}
+{{- end -}}
+
+{{- define "grafana-agent.logs.clusterRoleBinding.name" -}}
+{{- printf "grafana-agent-logs" -}}
+{{- end -}}
+
+{{- define "grafana-agent.logs.daemonSet.name" -}}
+{{- printf "grafana-agent-logs" -}}
+{{- end -}}
+
+{{- define "grafana-agent.logs.configMap.name" -}}
+{{- printf "grafana-agent-logs" -}}
+{{- end -}}

charts/grafana-agent/templates/clusterrole.yaml

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+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: {{ template "grafana-agent.metrics.clusterRole.name" }}
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - nodes
+  - nodes/proxy
+  - services
+  - endpoints
+  - pods
+  - events
+  verbs:
+  - get
+  - list
+  - watch
+- nonResourceURLs:
+  - /metrics
+  verbs:
+  - get
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: {{ template "grafana-agent.logs.clusterRole.name" }}
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - nodes
+  - nodes/proxy
+  - services
+  - endpoints
+  - pods
+  - events
+  verbs:
+  - get
+  - list
+  - watch
+- nonResourceURLs:
+  - /metrics
+  verbs:
+  - get

charts/grafana-agent/templates/clusterrolebinding.yaml

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+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: {{ template "grafana-agent.metrics.clusterRoleBinding.name" }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: {{ template "grafana-agent.metrics.clusterRole.name" }}
+subjects:
+- kind: ServiceAccount
+  name: {{ template "grafana-agent.metrics.serviceAccount.name" }}
+  namespace: {{ .Release.Namespace }}
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: {{ template "grafana-agent.logs.clusterRoleBinding.name" }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: {{ template "grafana-agent.logs.clusterRole.name" }}
+subjects:
+- kind: ServiceAccount
+  name: {{ template "grafana-agent.logs.serviceAccount.name" }}
+  namespace: {{ .Release.Namespace }}