Alerting: Foundations of historian app. (#114463)

We have two historians in alerting - alert state and notification. The intention
of this app is to provide query capabilities for both.

In this initial commit, the existing /history API is simply cloned to the new
app. It is identical except that it will send Kubernetes-style error responses
instead of Grafana-style.

This approach was taken to implement the new app more iteratively - ideally we
would define a new API, but this requires quite a significant overhaul of the
backend code.

apps/alerting/historian/plugin/src/generated/dummy/v0alpha1/dummy_object_gen.ts

@@ -0,0 +1,49 @@
+/*
+ * This file was generated by grafana-app-sdk. DO NOT EDIT.
+ */
+import { Spec } from './types.spec.gen';
+import { Status } from './types.status.gen';
+
+export interface Metadata {
+    name: string;
+    namespace: string;
+    generateName?: string;
+    selfLink?: string;
+    uid?: string;
+    resourceVersion?: string;
+    generation?: number;
+    creationTimestamp?: string;
+    deletionTimestamp?: string;
+    deletionGracePeriodSeconds?: number;
+    labels?: Record<string, string>;
+    annotations?: Record<string, string>;
+    ownerReferences?: OwnerReference[];
+    finalizers?: string[];
+    managedFields?: ManagedFieldsEntry[];
+}
+
+export interface OwnerReference {
+    apiVersion: string;
+    kind: string;
+    name: string;
+    uid: string;
+    controller?: boolean;
+    blockOwnerDeletion?: boolean;
+}
+
+export interface ManagedFieldsEntry {
+    manager?: string;
+    operation?: string;
+    apiVersion?: string;
+    time?: string;
+    fieldsType?: string;
+    subresource?: string;
+}
+
+export interface Dummy {
+    kind: string;
+    apiVersion: string;
+    metadata: Metadata;
+    spec: Spec;
+    status: Status;
+}

apps/alerting/historian/plugin/src/generated/dummy/v0alpha1/types.metadata.gen.ts

@@ -0,0 +1,30 @@
+// Code generated - EDITING IS FUTILE. DO NOT EDIT.
+
+// metadata contains embedded CommonMetadata and can be extended with custom string fields
+// TODO: use CommonMetadata instead of redefining here; currently needs to be defined here
+// without external reference as using the CommonMetadata reference breaks thema codegen.
+export interface Metadata {
+	updateTimestamp: string;
+	createdBy: string;
+	uid: string;
+	creationTimestamp: string;
+	deletionTimestamp?: string;
+	finalizers: string[];
+	resourceVersion: string;
+	generation: number;
+	updatedBy: string;
+	labels: Record<string, string>;
+}
+
+export const defaultMetadata = (): Metadata => ({
+	updateTimestamp: "",
+	createdBy: "",
+	uid: "",
+	creationTimestamp: "",
+	finalizers: [],
+	resourceVersion: "",
+	generation: 0,
+	updatedBy: "",
+	labels: {},
+});
+

apps/alerting/historian/plugin/src/generated/dummy/v0alpha1/types.spec.gen.ts

@@ -0,0 +1,11 @@
+// Code generated - EDITING IS FUTILE. DO NOT EDIT.
+
+// Spec is the schema of our resource. The spec should include all the user-editable information for the kind.
+export interface Spec {
+	dummyField: number;
+}
+
+export const defaultSpec = (): Spec => ({
+	dummyField: 0,
+});
+

apps/alerting/historian/plugin/src/generated/dummy/v0alpha1/types.status.gen.ts

@@ -0,0 +1,30 @@
+// Code generated - EDITING IS FUTILE. DO NOT EDIT.
+
+export interface OperatorState {
+	// lastEvaluation is the ResourceVersion last evaluated
+	lastEvaluation: string;
+	// state describes the state of the lastEvaluation.
+	// It is limited to three possible states for machine evaluation.
+	state: "success" | "in_progress" | "failed";
+	// descriptiveState is an optional more descriptive state field which has no requirements on format
+	descriptiveState?: string;
+	// details contains any extra information that is operator-specific
+	details?: Record<string, any>;
+}
+
+export const defaultOperatorState = (): OperatorState => ({
+	lastEvaluation: "",
+	state: "success",
+});
+
+export interface Status {
+	// operatorStates is a map of operator ID to operator state evaluations.
+	// Any operator which consumes this kind SHOULD add its state evaluation information to this field.
+	operatorStates?: Record<string, OperatorState>;
+	// additionalFields is reserved for future use
+	additionalFields?: Record<string, any>;
+}
+
+export const defaultStatus = (): Status => ({
+});
+