fix(@astrojs/telemetry): add optional integrations field (#3614)

* fix: filter out falsy integration from telemetry

Falsy integrations are now ignored in `@astrojs/telemetry`

This error should no longer occur,
```ts
 error   Cannot read properties of null (reading 'name')
    at file:///workspaces/bundle/node_modules/.pnpm/@astrojs+telemetry@0.1.2/node_modules/@astrojs/telemetry/dist/events/session.js:53:117
    ...
```

* ci: add tests for optional integrations

* ci: add changeset

* fix(@astrojs/telemetry): count number of optional integrations in use

* ci: add test for counting the total number of optional integrations in use

* ci: update changeset

* chore: make the changes @tony-sull sugested

* revert(@astrojs/webapi): mod.d.ts -> a4c78b5: [ci] format

* ci: remove `@astrojs/webapi` patch change

* chore(@astrojs/telemetry): remove totalIntegrations payload field

* fix(@astrojs/telemetry): add optional integrations field

* ci: add changeset

4 files changed, 63 insertions, 4 deletions

diff --git a/.changeset/four-numbers-flash.md b/.changeset/four-numbers-flash.md
new file mode 100644
index 000000000..4e6046624
--- /dev/null
+++ b/.changeset/four-numbers-flash.md
@@ -0,0 +1,7 @@
+---
+'@astrojs/telemetry': patch
+---
+
+Fix telemetry crashing astro build/dev when using optional integrations
+
+Telemetry will now ignore falsy integration values but will gather a count of how many integrations out of the total are now optional integrations
\ No newline at end of file
diff --git a/.changeset/funny-terms-matter.md b/.changeset/funny-terms-matter.md
new file mode 100644
index 000000000..50e953fe0
--- /dev/null
+++ b/.changeset/funny-terms-matter.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/telemetry': patch
+---
+
+Add's optional integrations field to `@astrojs/telemetry`'s payload
diff --git a/packages/telemetry/src/events/session.ts b/packages/telemetry/src/events/session.ts
index 995cf5075..babd09e55 100644
--- a/packages/telemetry/src/events/session.ts
+++ b/packages/telemetry/src/events/session.ts
@@ -36,6 +36,7 @@ interface EventCliSessionInternal extends EventCliSession {
 	config?: ConfigInfo;
 	configKeys?: string[];
 	flags?: string[];
+	optionalIntegrations?: number;
 }
 
 function getViteVersion() {
@@ -89,6 +90,8 @@ export function eventCliSession(
 	userConfig?: AstroUserConfig,
 	flags?: Record<string, any>
 ): { eventName: string; payload: EventCliSessionInternal }[] {
+	// Filter out falsy integrations
+	const integrations = userConfig?.integrations?.filter?.(Boolean) ?? [];
 	const configValues = userConfig
 		? {
 				markdownPlugins: [
@@ -96,17 +99,17 @@ export function eventCliSession(
 					userConfig?.markdown?.rehypePlugins ?? [],
 				].flat(1),
 				adapter: userConfig?.adapter?.name ?? null,
-				integrations: userConfig?.integrations?.map((i: any) => i.name) ?? [],
+				integrations: integrations?.map?.((i: any) => i?.name) ?? [],
 				trailingSlash: userConfig?.trailingSlash,
 				build: userConfig?.build
 					? {
-							format: userConfig?.build?.format,
+						format: userConfig?.build?.format,
 					  }
 					: undefined,
 				markdown: userConfig?.markdown
 					? {
-							mode: userConfig?.markdown?.mode,
-							syntaxHighlight: userConfig.markdown?.syntaxHighlight,
+						mode: userConfig?.markdown?.mode,
+						syntaxHighlight: userConfig.markdown?.syntaxHighlight,
 					  }
 					: undefined,
 		  }
@@ -125,6 +128,8 @@ export function eventCliSession(
 		// Config Values
 		config: configValues,
 		flags: cliFlags,
+		// Optional integrations
+		optionalIntegrations: userConfig?.integrations?.length - integrations?.length
 	};
 	return [{ eventName: EVENT_SESSION, payload }];
 }
diff --git a/packages/telemetry/test/session-event.test.js b/packages/telemetry/test/session-event.test.js
index 70705512f..07b214c30 100644
--- a/packages/telemetry/test/session-event.test.js
+++ b/packages/telemetry/test/session-event.test.js
@@ -411,6 +411,48 @@ describe('Session event', () => {
 		});
 	});
 
+	describe('config.integrations + optionalIntegrations', () => {
+		it('optional/conditional integrations', () => {
+			const config = {
+				srcDir: 1,
+				integrations: [
+					null,
+					undefined,
+					{ name: "example-integration" }
+				]
+			};
+			const [{ payload }] = events.eventCliSession(
+				{
+					cliCommand: 'dev',
+					astroVersion: '0.0.0',
+				},
+				config
+			);
+			expect(payload.config.integrations).deep.equal(["example-integration"]);
+			expect(payload.optionalIntegrations).to.equal(2);
+		}); 
+		
+		it('falsy integrations', () => {
+			const config = {
+				srcDir: 1,
+				integrations: [
+					null,
+					undefined,
+					false
+				]
+			};
+			const [{ payload }] = events.eventCliSession(
+				{
+					cliCommand: 'dev',
+					astroVersion: '0.0.0',
+				},
+				config
+			);
+			expect(payload.config.integrations.length).to.equal(0);
+			expect(payload.optionalIntegrations).to.equal(3);
+		});
+	});
+
 	describe('flags', () => {
 		it('includes cli flags in payload', () => {
 			const config = {};