Count the number of regions deployed to (#3948)

* Count the number of regions deployed to

* Add test

Co-authored-by: Daniel Lee <danielylee@google.com>

src/deploy/functions/release/reporter.ts

@@ -59,8 +59,10 @@ export async function logAndTrackDeployStats(summary: Summary): Promise<void> {
   let totalAborts = 0;
   const reports: Array<Promise<void>> = [];
 
+  const regions = new Set<string>();
   for (const result of summary.results) {
     const tag = triggerTag(result.endpoint);
+    regions.add(result.endpoint.region);
     totalTime += result.durationMs;
     if (!result.error) {
       totalSuccesses++;
@@ -74,6 +76,9 @@ export async function logAndTrackDeployStats(summary: Summary): Promise<void> {
     }
   }
 
+  const regionCountTag = regions.size < 5 ? regions.size.toString() : ">=5";
+  reports.push(track.track("functions_region_count", regionCountTag, 1));
+
   const gcfv1 = summary.results.find((r) => r.endpoint.platform === "gcfv1");
   const gcfv2 = summary.results.find((r) => r.endpoint.platform === "gcfv2");
   const tag = gcfv1 && gcfv2 ? "v1+v2" : gcfv1 ? "v1" : "v2";

src/test/deploy/functions/release/reporter.spec.ts

@@ -132,6 +132,7 @@ describe("reporter", () => {
 
       await reporter.logAndTrackDeployStats(summary);
 
+      expect(trackStub).to.have.been.calledWith("functions_region_count", "1", 1);
       expect(trackStub).to.have.been.calledWith("function_deploy_success", "v1.https", 2_000);
       expect(trackStub).to.have.been.calledWith("function_deploy_failure", "v1.https", 1_000);
       // Aborts aren't tracked because they would throw off timing metrics