chore: Datadog addon, ability to include source type name (#4196)

## About the changes
Include a new configuration parameter to be able to specify
source_type_name. This is an opt-in feature which provides backward
compatibility to our existing users.


![image](https://github.com/Unleash/unleash/assets/455064/0e65584f-f601-4f17-b7a5-e73dae55772e)


Closes #4109 

## Discussion points
Maybe this should be hardcoded to `Unleash` but this gives additional
flexibility

src/lib/addons/__snapshots__/datadog.test.ts.snap

@@ -17,3 +17,12 @@ exports[`Should include customHeaders in headers when calling service 2`] = `
   "MY_CUSTOM_HEADER": "MY_CUSTOM_VALUE",
 }
 `;
+
+exports[`Should not include source_type_name when included in the config 1`] = `"{"text":"%%% \\n some@user.com *disabled* [some-toggle](http://some-url.com/projects/default/features/some-toggle) in *development* environment in project *default* \\n %%% ","title":"Unleash notification update","source_type_name":"my-custom-source-type"}"`;
+
+exports[`Should not include source_type_name when included in the config 2`] = `
+{
+  "Content-Type": "application/json",
+  "DD-API-KEY": "fakeKey",
+}
+`;

src/lib/addons/datadog-definition.ts

@@ -40,6 +40,15 @@ const dataDogDefinition: IAddonDefinition = {
             required: true,
             sensitive: true,
         },
+        {
+            name: 'sourceTypeName',
+            displayName: 'Datadog Source Type Name',
+            description:
+                '(Optional) source_type_name parameter to be included in Datadog events.',
+            type: 'text',
+            required: false,
+            sensitive: false,
+        },
         {
             name: 'customHeaders',
             displayName: 'Extra HTTP Headers',

src/lib/addons/datadog.test.ts

@@ -179,3 +179,37 @@ test(`Should include customHeaders in headers when calling service`, async () =>
     expect(fetchRetryCalls[0].options.body).toMatchSnapshot();
     expect(fetchRetryCalls[0].options.headers).toMatchSnapshot();
 });
+
+test(`Should not include source_type_name when included in the config`, async () => {
+    const addon = new DatadogAddon({
+        getLogger: noLogger,
+        unleashUrl: 'http://some-url.com',
+    });
+    const event: IEvent = {
+        id: 2,
+        createdAt: new Date(),
+        type: FEATURE_ENVIRONMENT_DISABLED,
+        createdBy: 'some@user.com',
+        environment: 'development',
+        project: 'default',
+        featureName: 'some-toggle',
+        data: {
+            name: 'some-toggle',
+        },
+    };
+
+    const parameters = {
+        url: 'http://hooks.slack.com',
+        apiKey: 'fakeKey',
+        sourceTypeName: 'my-custom-source-type',
+    };
+
+    await addon.handleEvent(event, parameters);
+    expect(fetchRetryCalls).toHaveLength(1);
+    expect(fetchRetryCalls[0].url).toBe(parameters.url);
+    expect(fetchRetryCalls[0].options.body).toMatch(
+        /"source_type_name":"my-custom-source-type"/,
+    );
+    expect(fetchRetryCalls[0].options.body).toMatchSnapshot();
+    expect(fetchRetryCalls[0].options.headers).toMatchSnapshot();
+});

src/lib/addons/datadog.ts

@@ -12,9 +12,17 @@ import { IEvent } from '../types/events';
 interface IDatadogParameters {
     url: string;
     apiKey: string;
+    sourceTypeName?: string;
     customHeaders?: string;
 }
 
+interface DDRequestBody {
+    text: string;
+    title: string;
+    tags?: string[];
+    source_type_name?: string;
+}
+
 export default class DatadogAddon extends Addon {
     private msgFormatter: FeatureEventFormatter;
 
@@ -26,7 +34,6 @@ export default class DatadogAddon extends Addon {
         );
     }
 
-    // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
     async handleEvent(
         event: IEvent,
         parameters: IDatadogParameters,
@@ -34,6 +41,7 @@ export default class DatadogAddon extends Addon {
         const {
             url = 'https://api.datadoghq.com/api/v1/events',
             apiKey,
+            sourceTypeName,
             customHeaders,
         } = parameters;
 
@@ -42,11 +50,14 @@ export default class DatadogAddon extends Addon {
         const { tags: eventTags } = event;
         const tags =
             eventTags && eventTags.map((tag) => `${tag.type}:${tag.value}`);
-        const body = {
+        const body: DDRequestBody = {
             text: `%%% \n ${text} \n %%% `,
             title: 'Unleash notification update',
             tags,
         };
+        if (sourceTypeName) {
+            body.source_type_name = sourceTypeName;
+        }
         let extraHeaders = {};
         if (typeof customHeaders === 'string' && customHeaders.length > 1) {
             try {