diff --git a/src/lib/metrics.ts b/src/lib/metrics.ts
index 87eba0901e..e9de062ca9 100644
--- a/src/lib/metrics.ts
+++ b/src/lib/metrics.ts
@@ -195,12 +195,6 @@ export default class MetricsMonitor {
             labelNames: ['sdk_name', 'sdk_version'],
         });
 
-        const optimal304DiffingCounter = new client.Counter({
-            name: 'optimal_304_diffing',
-            help: 'Count the Optimal 304 diffing with status',
-            labelNames: ['status'],
-        });
-
         const productionChanges30 = new client.Gauge({
             name: 'production_changes_30',
             help: 'Changes made to production environment last 30 days',
@@ -361,10 +355,6 @@ export default class MetricsMonitor {
             schedulerDuration.labels(jobId).observe(time);
         });
 
-        eventBus.on('optimal304Differ', ({ status }) => {
-            optimal304DiffingCounter.labels(status).inc();
-        });
-
         eventBus.on(events.DB_TIME, ({ store, action, time }) => {
             dbDuration.labels(store, action).observe(time);
         });