feat: Remove extension hello check as it's redundant

Author: astuyve

src/metrics/extension.spec.ts

@@ -11,20 +11,9 @@ describe("isAgentRunning", () => {
     mock({
       "/opt/extensions/datadog-agent": Buffer.from([0]),
     });
-    const scope = nock(AGENT_URL).get("/lambda/hello").reply(200);
     const ran = await isAgentRunning();
-    expect(scope.isDone()).toBeTruthy();
     expect(ran).toBeTruthy();
   });
-  it("returns false when agent doesn't respond", async () => {
-    mock({
-      "/opt/extensions/datadog-agent": Buffer.from([0]),
-    });
-    const scope = nock(AGENT_URL).get("/lambda/hello").replyWithError("Unreachable");
-    const ran = await isAgentRunning();
-    expect(scope.isDone()).toBeTruthy();
-    expect(ran).toBeFalsy();
-  });
   it("returns false when agent doesn't exist", async () => {
     mock({});
     const scope = nock(AGENT_URL).get("/lambda/hello").replyWithError("Unreachable");

src/metrics/extension.ts

@@ -14,13 +14,6 @@ export async function isAgentRunning() {
     logDebug(`Agent isn't present in sandbox`);
     return false;
   }
-
-  const url = new URL(HELLO_PATH, AGENT_URL);
-  const result = await get(url, { timeout: AGENT_TIMEOUT_MS });
-  if (!result.success) {
-    logDebug(`Could not connect to agent. ${result.errorMessage}`);
-    return false;
-  }
   return true;
 }
 

src/metrics/listener.spec.ts

@@ -105,7 +105,6 @@ describe("MetricsListener", () => {
     expect(spy).toHaveBeenCalledWith(`{"e":1487076708,"m":"my-metric","t":["tag:a","tag:b"],"v":10}\n`);
   });
   it("always sends metrics to statsD when extension is enabled, ignoring logForwarding=true", async () => {
-    const helloScope = nock(AGENT_URL).get("/lambda/hello").reply(200);
     const flushScope = nock(AGENT_URL).post("/lambda/flush", JSON.stringify({})).reply(200);
     mock({
       "/opt/extensions/datadog-agent": Buffer.from([0]),
@@ -135,7 +134,6 @@ describe("MetricsListener", () => {
     await listener.onStartInvocation({});
     listener.sendDistributionMetric("my-metric", 10, false, "tag:a", "tag:b");
     await listener.onCompleteInvocation();
-    expect(helloScope.isDone()).toBeTruthy();
     expect(flushScope.isDone()).toBeTruthy();
     expect(distributionMock).toHaveBeenCalledWith("my-metric", 10, undefined, ["tag:a", "tag:b"]);
   });