[release-v2.8] Feature Charts batch release for rancher-monitoring

charts/rancher-monitoring-crd/102.0.2+up40.1.2/Chart.yaml

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+annotations:
+  catalog.cattle.io/certified: rancher
+  catalog.cattle.io/hidden: "true"
+  catalog.cattle.io/namespace: cattle-monitoring-system
+  catalog.cattle.io/release-name: rancher-monitoring-crd
+apiVersion: v1
+description: Installs the CRDs for rancher-monitoring.
+name: rancher-monitoring-crd
+type: application
+version: 102.0.2+up40.1.2

charts/rancher-monitoring-crd/102.0.2+up40.1.2/README.md

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+# rancher-monitoring-crd
+A Rancher chart that installs the CRDs used by rancher-monitoring.
+
+## How does this chart work?
+
+This chart marshalls all of the CRD files placed in the `crd-manifest` directory into a ConfigMap that is installed onto a cluster alongside relevant RBAC (ServiceAccount, ClusterRoleBinding, ClusterRole, and PodSecurityPolicy).
+
+Once the relevant dependent resourcees are installed / upgraded / rolled back, this chart executes a post-install / post-upgrade / post-rollback Job that:
+- Patches any existing versions of the CRDs contained within the `crd-manifest` on the cluster to set `spec.preserveUnknownFields=false`; this step is required since, based on [Kubernetes docs](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/#field-pruning) and a [known workaround](https://github.com/kubernetes-sigs/controller-tools/issues/476#issuecomment-691519936), such CRDs cannot be upgraded normally from `apiextensions.k8s.io/v1beta1` to `apiextensions.k8s.io/v1`.
+- Runs a `kubectl apply` on the CRDs that are contained within the crd-manifest ConfigMap to upgrade CRDs in the cluster
+
+On an uninstall, this chart executes a separate post-delete Job that:
+- Patches any existing versions of the CRDs contained within `crd-manifest` on the cluster to set `metadata.finalizers=[]`
+- Runs a `kubectl delete` on the CRDs that are contained within the crd-manifest ConfigMap to clean up the CRDs from the cluster
+
+Note: If the relevant CRDs already existed in the cluster at the time of install, this chart will absorb ownership of the lifecycle of those CRDs; therefore, on a `helm uninstall`, those CRDs will also be removed from the cluster alongside this chart.
+
+## Why can't we just place the CRDs in the templates/ directory of the main chart?
+
+In Helm today, you cannot declare a CRD and declare a resource of that CRD's kind in templates/ without encountering a failure on render.
+
+## [Helm 3] Why can't we just place the CRDs in the crds/ directory of the main chart?
+
+The Helm 3 `crds/` directory only supports the installation of CRDs, but does not support the upgrade and removal of CRDs, unlike what this chart facilitiates.

charts/rancher-monitoring-crd/102.0.2+up40.1.2/crd-manifest/crd-prometheusrules.yaml

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+# https://raw.githubusercontent.com/prometheus-operator/prometheus-operator/v0.59.1/example/prometheus-operator-crd/monitoring.coreos.com_prometheusrules.yaml
+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    controller-gen.kubebuilder.io/version: v0.9.2
+  creationTimestamp: null
+  name: prometheusrules.monitoring.coreos.com
+spec:
+  group: monitoring.coreos.com
+  names:
+    categories:
+    - prometheus-operator
+    kind: PrometheusRule
+    listKind: PrometheusRuleList
+    plural: prometheusrules
+    shortNames:
+    - promrule
+    singular: prometheusrule
+  scope: Namespaced
+  versions:
+  - name: v1
+    schema:
+      openAPIV3Schema:
+        description: PrometheusRule defines recording and alerting rules for a Prometheus
+          instance
+        properties:
+          apiVersion:
+            description: 'APIVersion defines the versioned schema of this representation
+              of an object. Servers should convert recognized schemas to the latest
+              internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
+            type: string
+          kind:
+            description: 'Kind is a string value representing the REST resource this
+              object represents. Servers may infer this from the endpoint the client
+              submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
+            type: string
+          metadata:
+            type: object
+          spec:
+            description: Specification of desired alerting rule definitions for Prometheus.
+            properties:
+              groups:
+                description: Content of Prometheus rule file
+                items:
+                  description: 'RuleGroup is a list of sequentially evaluated recording
+                    and alerting rules. Note: PartialResponseStrategy is only used
+                    by ThanosRuler and will be ignored by Prometheus instances.  Valid
+                    values for this field are ''warn'' or ''abort''.  More info: https://github.com/thanos-io/thanos/blob/main/docs/components/rule.md#partial-response'
+                  properties:
+                    interval:
+                      type: string
+                    name:
+                      type: string
+                    partial_response_strategy:
+                      type: string
+                    rules:
+                      items:
+                        description: 'Rule describes an alerting or recording rule
+                          See Prometheus documentation: [alerting](https://www.prometheus.io/docs/prometheus/latest/configuration/alerting_rules/)
+                          or [recording](https://www.prometheus.io/docs/prometheus/latest/configuration/recording_rules/#recording-rules)
+                          rule'
+                        properties:
+                          alert:
+                            type: string
+                          annotations:
+                            additionalProperties:
+                              type: string
+                            type: object
+                          expr:
+                            anyOf:
+                            - type: integer
+                            - type: string
+                            x-kubernetes-int-or-string: true
+                          for:
+                            type: string
+                          labels:
+                            additionalProperties:
+                              type: string
+                            type: object
+                          record:
+                            type: string
+                        required:
+                        - expr
+                        type: object
+                      type: array
+                  required:
+                  - name
+                  - rules
+                  type: object
+                type: array
+            type: object
+        required:
+        - spec
+        type: object
+    served: true
+    storage: true