chore: update counter to histogram to collect the identifier counts

Author: ItsSudip

src/util/prometheus.js

@@ -635,18 +635,6 @@ class Prometheus {
         type: 'counter',
         labelNames: ['identifier_type', 'destination_id'],
       },
-      {
-        name: 'braze_lookup_failure_count',
-        help: 'braze look-up failure count',
-        type: 'counter',
-        labelNames: ['http_status', 'destination_id'],
-      },
-      {
-        name: 'braze_lookup_success_count',
-        help: 'Count of events where user look up was successful in Braze destination transformation.',
-        type: 'counter',
-        labelNames: ['http_status', 'destination_id'],
-      },
       {
         name: 'braze_lookup_time',
         help: 'braze look-up time',
@@ -671,10 +659,18 @@ class Prometheus {
         ],
       },
       {
-        name: 'braze_dedup_skipped_due_to_lookup_failure_count',
-        help: 'Count of events that skipped deduplication due to lookup API failure',
-        type: 'counter',
+        name: 'braze_lookup_failure_identifiers',
+        help: 'Count of identifiers that failed to lookup due to API failure',
+        type: 'histogram',
+        labelNames: ['destination_id', 'http_status'],
+        buckets: [0, 10, 20, 30, 40, 50],
+      },
+      {
+        name: 'braze_lookup_success_identifiers',
+        help: 'Count of identifiers that successfully looked up due to API failure',
+        type: 'histogram',
         labelNames: ['destination_id'],
+        buckets: [0, 10, 20, 30, 40, 50],
       },
       {
         name: 'fb_custom_audience_event_having_all_null_field_values_for_a_user',

src/v0/destinations/braze/util.js

@@ -265,16 +265,19 @@ const BrazeDedupUtility = {
             ...externalIdentifiers.map((id) => id.external_id),
             ...aliasIdentifiers.map((id) => id.alias_name),
           ];
-          stats.counter('braze_lookup_failure_count', 1, {
+          stats.histogram('braze_lookup_failure_identifiers', failedIdentifiers.length, {
             http_status: lookUpResponse.status,
             destination_id: destination.ID,
           });
           return { users: [], failedIdentifiers };
         }
-        stats.counter('braze_lookup_success_count', 1, {
-          http_status: lookUpResponse.status,
-          destination_id: destination.ID,
-        });
+        stats.histogram(
+          'braze_lookup_success_identifiers',
+          externalIdentifiers.length + aliasIdentifiers.length,
+          {
+            destination_id: destination.ID,
+          },
+        );
         const { users } = lookUpResponse.response;
         return { users: users || [], failedIdentifiers: [] };
       }),