chore(metrics): redesign with opus because of course

apps/chat/src/index.ts

@@ -13,6 +13,7 @@ import {
   recordChatModerationBlock,
   recordDeliveredChatMessage,
   recordDeliveredChatMessageBytes,
+  recordEmojiSearchResults,
   recordHistoryMessagesLoaded,
   recordIncomingChatMessage,
   recordUniqueChatter,
@@ -772,6 +773,7 @@ app.get(
           const rawSearchTerm = (msg.searchTerm as string)?.trim() ?? '';
           if (!rawSearchTerm || rawSearchTerm.length > 50) {
             ws.send(JSON.stringify({ type: 'emojiSearchResponse', results: [] }));
+            recordEmojiSearchResults('empty', 0);
             outcome = 'emoji_search_empty';
             return;
           }
@@ -802,6 +804,7 @@ app.get(
                 results: results,
               })
             );
+            recordEmojiSearchResults('matched', results.length);
             outcome = 'emoji_search';
           } else {
             ws.send(
@@ -810,6 +813,7 @@ app.get(
                 results: [],
               })
             );
+            recordEmojiSearchResults('no_match', 0);
             outcome = 'emoji_search_empty';
           }
         }

apps/chat/src/metrics.ts

@@ -114,6 +114,14 @@ function createMetricsStore() {
     registers: [register],
   });
 
+  const emojiSearchResults = new Histogram({
+    name: 'hctv_chat_emoji_search_results',
+    help: 'Number of emoji search results returned per query.',
+    labelNames: ['outcome'],
+    buckets: [0, 1, 2, 5, 10, 25, 50, 100, 150],
+    registers: [register],
+  });
+
   const errors = new Counter({
     name: 'hctv_chat_errors_total',
     help: 'Errors observed in the chat service grouped by phase.',
@@ -126,6 +134,7 @@ function createMetricsStore() {
     deliveredMessageBytes,
     channelHistoryLoadedMessages,
     channelHistorySize,
+    emojiSearchResults,
     errors,
     inboundPayloadBytes,
     incomingMessages,
@@ -232,3 +241,7 @@ export function recordChatModerationBlock(reason: string): void {
 export function recordChatError(phase: string): void {
   metrics.errors.inc({ phase });
 }
+
+export function recordEmojiSearchResults(outcome: string, count: number): void {
+  metrics.emojiSearchResults.observe({ outcome }, count);
+}