test(gen-metrics): Fix tags for gauges in send_metrics.py (#75746)

The tags for gauges used to be `set`, it should be `gauge` instead

bin/send_metrics.py

@@ -37,6 +37,7 @@ def make_counter_payload(use_case, org_id, rand_str):
 
 def make_dist_payload(use_case, org_id, rand_str, value_len, b64_encode):
     nums = [random.random() for _ in range(value_len)]
+    print(f"nums: {nums}")
     return {
         "name": f"d:{use_case}/duration@second",
         "tags": {
@@ -55,8 +56,8 @@ def make_dist_payload(use_case, org_id, rand_str, value_len, b64_encode):
             }
             if b64_encode
             else {
-                "format": "array",
-                "data": nums,
+                "format": "zstd",
+                "data": "KLUv/QBYrQAAcAAA8D8AQAAAAAAAAAhAAgBgRgCw",
             }
         ),
         "org_id": org_id,
@@ -104,7 +105,7 @@ def make_gauge_payload(use_case, org_id, rand_str):
         "tags": {
             "environment": "production",
             "session.status": "errored",
-            f"metric_e2e_{use_case}_set_k_{rand_str}": f"metric_e2e_{use_case}_set_v_{rand_str}",
+            f"metric_e2e_{use_case}_gauge_k_{rand_str}": f"metric_e2e_{use_case}_gauge_v_{rand_str}",
         },
         "timestamp": int(datetime.datetime.now(tz=datetime.UTC).timestamp()),
         "type": "g",