feat: add dropped spans data to end span

src/globals.ts

@@ -83,6 +83,10 @@ export class SpansContainer {
     }
   }
 
+  static getDroppedSpansReasons(): { [reason: string]: number } {
+    return this.droppedSpansReasons;
+  }
+
   static getSpans(): BasicSpan[] {
     return Object.values(this.spans);
   }

src/reporter.ts

@@ -161,6 +161,8 @@ export function getPrioritizedSpans(spans: any[], maxSendBytes: number): any[] {
       false,
       spansDropped
     );
+
+    // TODO: update the end span with the new recorded drops
   }
 
   return Object.values(spansToSend);
@@ -223,8 +225,6 @@ export const forgeAndScrubRequestBody = (
     logger.debug(`Trimmed spans due to size`);
   }
 
-  // TODO: Add dropped spans details to the lambda end span (find it from the spans array)
-
   logger.debug(`Filtered [${beforeLength - spans.length}] spans out`);
   logger.debug(`Filtering and scrubbing, Took: [${new Date().getTime() - start}ms]`);
   return spans.length > 0 ? JSON.stringify(spans) : undefined;

src/spans/awsSpan.ts

@@ -288,6 +288,7 @@ export const getEndFunctionSpan = (functionSpan, handlerReturnValue) => {
     event,
     envs,
     totalSpans,
+    droppedSpansReasons: SpansContainer.getDroppedSpansReasons(),
   });
   logger.debug('End span created', newSpan);
   return newSpan;