diff --git a/toolkit/components/telemetry/Histograms.json b/toolkit/components/telemetry/Histograms.json
index 388cd09b487..dd040aba4bf 100644
--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -4152,6 +4152,12 @@
     "extended_statistics_ok": true,
     "description": "Number of histograms with total count low errors"
   },
+  "TELEMETRY_FILES_EVICTED": {
+    "expires_in_version": "36",
+    "kind": "enumerated",
+    "n_values": 30,
+    "description": "Number of telemetry pings evicted at startup"
+  },
   "TELEMETRY_TEST_FLAG": {
     "expires_in_version": "never",
     "kind": "flag",
diff --git a/toolkit/components/telemetry/TelemetryFile.jsm b/toolkit/components/telemetry/TelemetryFile.jsm
index 65598eb031c..2c17000fc37 100644
--- a/toolkit/components/telemetry/TelemetryFile.jsm
+++ b/toolkit/components/telemetry/TelemetryFile.jsm
@@ -179,6 +179,9 @@ this.TelemetryFile = {
         }
 
         yield Promise.all(result);
+
+        Services.telemetry.getHistogramById('TELEMETRY_FILES_EVICTED').
+          add(sortedEntries.length - MAX_LRU_PINGS);
       }
 
       yield iter.close();