Fix getEnhancedMetricTags on local env

Author: jeromemacias

src/metrics/enhanced-metrics.spec.ts

@@ -14,6 +14,7 @@ const mockContext = ({
 } as any) as Context;
 const mockContextLocal = ({
   functionName: "my-test-lambda",
+  functionVersion: "1.0.0",
   memoryLimitInMB: "128",
 } as any) as Context;
 
@@ -64,6 +65,7 @@ describe("getEnhancedMetricTags", () => {
     mockedGetProcessVersion.mockReturnValue("v8.10.0");
     expect(getEnhancedMetricTags(mockContextLocal)).toStrictEqual([
       "functionname:my-test-lambda",
+
       "cold_start:true",
       "memorysize:128",
       "runtime:nodejs8.10",

src/metrics/enhanced-metrics.ts

@@ -45,10 +45,8 @@ export function getRuntimeTag(): string | null {
 
 export function getEnhancedMetricTags(context: Context): string[] {
   let arnTags = [`functionname:${context.functionName}`];
-  if (context.functionVersion) {
+  if (context.invokedFunctionArn) {
     arnTags = parseTagsFromARN(context.invokedFunctionArn, context.functionVersion);
-  } else if (context.invokedFunctionArn) {
-    arnTags = parseTagsFromARN(context.invokedFunctionArn);
   }
   const tags = [...arnTags, getColdStartTag(), `memorysize:${context.memoryLimitInMB}`];