[FFM-9621] - Avoid sending empty metric payloads (#89)

* [FFM-9621] - Avoid sending empty metric payloads

What
Adds a check to make sure metrics data is not empty before sending it.

Why
We're seeing empty metrics payloads arriving at the BE we should avoid wasting network bandwidth.

Testing
Manual

Co-authored-by: Kevin Nagurski <[email protected]>

Author: andybharness

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@harnessio/ff-nodejs-server-sdk",
-  "version": "1.3.4",
+  "version": "1.3.5",
   "description": "Feature flags SDK for NodeJS environments",
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.mjs",

package.json

@@ -188,7 +188,8 @@ export const MetricsProcessor = (
     }
 
     const metrics: Metrics = _summarize();
-    if (metrics) {
+
+    if (metrics && metrics.metricsData.length && metrics.targetData.length) {
       log.debug('Start sending metrics data');
       api
         .postMetrics(environment, cluster, metrics)

src/metrics.ts

@@ -1 +1 @@
-export const VERSION = "1.3.4";
+export const VERSION = "1.3.5";