Feat(#4205): add potentially stale events to addons (#4279)

This PR adds potentially stale events as available to all addons and
adds a formatted message.

## Discussion

I'd still be interested in hearing input on whether the event type
should be selectable by addons or not before we start emitting the
event. I'm leaning towards "yes", but I'll take your thoughts into
consideration.

src/lib/addons/datadog-definition.ts

@@ -13,6 +13,7 @@ import {
     FEATURE_METADATA_UPDATED,
     FEATURE_PROJECT_CHANGE,
     FEATURE_VARIANTS_UPDATED,
+    FEATURE_POTENTIALLY_STALE_ON,
 } from '../types/events';
 import { IAddonDefinition } from '../types/model';
 
@@ -77,6 +78,7 @@ const dataDogDefinition: IAddonDefinition = {
         FEATURE_METADATA_UPDATED,
         FEATURE_PROJECT_CHANGE,
         FEATURE_VARIANTS_UPDATED,
+        FEATURE_POTENTIALLY_STALE_ON,
     ],
     tagTypes: [
         {

src/lib/addons/feature-event-formatter-md.ts

@@ -4,6 +4,7 @@ import {
     FEATURE_ENVIRONMENT_DISABLED,
     FEATURE_ENVIRONMENT_ENABLED,
     FEATURE_METADATA_UPDATED,
+    FEATURE_POTENTIALLY_STALE_ON,
     FEATURE_PROJECT_CHANGE,
     FEATURE_REVIVED,
     FEATURE_STALE_OFF,
@@ -301,6 +302,13 @@ export class FeatureEventFormatterMd implements FeatureEventFormatter {
         return `${createdBy} moved ${featureName} to ${project}`;
     }
 
+    generateFeaturePotentiallyStaleOnText(event: IEvent): string {
+        const { project, createdBy } = event;
+        const feature = this.generateFeatureLink(event);
+
+        return `${createdBy} marked feature toggle *${feature}* (in project *${project}*) as *potentially stale*.`;
+    }
+
     featureLink(event: IEvent): string {
         const { type, project = '', featureName } = event;
         if (type === FEATURE_ARCHIVED) {
@@ -354,6 +362,8 @@ export class FeatureEventFormatterMd implements FeatureEventFormatter {
                 return this.generateMetadataText(event);
             case FEATURE_PROJECT_CHANGE:
                 return this.generateProjectChangeText(event);
+            case FEATURE_POTENTIALLY_STALE_ON:
+                return this.generateFeaturePotentiallyStaleOnText(event);
             default:
                 return this.defaultText(event);
         }

src/lib/addons/slack-app-definition.ts

@@ -13,6 +13,7 @@ import {
     FEATURE_METADATA_UPDATED,
     FEATURE_PROJECT_CHANGE,
     FEATURE_VARIANTS_UPDATED,
+    FEATURE_POTENTIALLY_STALE_ON,
 } from '../types/events';
 import { IAddonDefinition } from '../types/model';
 
@@ -63,6 +64,7 @@ const slackAppDefinition: IAddonDefinition = {
         FEATURE_METADATA_UPDATED,
         FEATURE_VARIANTS_UPDATED,
         FEATURE_PROJECT_CHANGE,
+        FEATURE_POTENTIALLY_STALE_ON,
     ],
     tagTypes: [
         {

src/lib/addons/slack-definition.ts

@@ -13,6 +13,7 @@ import {
     FEATURE_METADATA_UPDATED,
     FEATURE_PROJECT_CHANGE,
     FEATURE_VARIANTS_UPDATED,
+    FEATURE_POTENTIALLY_STALE_ON,
 } from '../types/events';
 import { IAddonDefinition } from '../types/model';
 
@@ -87,6 +88,7 @@ const slackDefinition: IAddonDefinition = {
         FEATURE_METADATA_UPDATED,
         FEATURE_VARIANTS_UPDATED,
         FEATURE_PROJECT_CHANGE,
+        FEATURE_POTENTIALLY_STALE_ON,
     ],
     tagTypes: [
         {

src/lib/addons/teams-definition.ts

@@ -13,6 +13,7 @@ import {
     FEATURE_METADATA_UPDATED,
     FEATURE_PROJECT_CHANGE,
     FEATURE_VARIANTS_UPDATED,
+    FEATURE_POTENTIALLY_STALE_ON,
 } from '../types/events';
 import { IAddonDefinition } from '../types/model';
 
@@ -58,6 +59,7 @@ const teamsDefinition: IAddonDefinition = {
         FEATURE_METADATA_UPDATED,
         FEATURE_VARIANTS_UPDATED,
         FEATURE_PROJECT_CHANGE,
+        FEATURE_POTENTIALLY_STALE_ON,
     ],
 };
 

src/lib/addons/webhook-definition.ts

@@ -24,6 +24,7 @@ import {
     CHANGE_REQUEST_CANCELLED,
     CHANGE_REQUEST_SENT_TO_REVIEW,
     CHANGE_REQUEST_APPLIED,
+    FEATURE_POTENTIALLY_STALE_ON,
 } from '../types/events';
 import { IAddonDefinition } from '../types/model';
 
@@ -117,6 +118,7 @@ const webhookDefinition: IAddonDefinition = {
         CHANGE_REQUEST_CANCELLED,
         CHANGE_REQUEST_SENT_TO_REVIEW,
         CHANGE_REQUEST_APPLIED,
+        FEATURE_POTENTIALLY_STALE_ON,
     ],
 };