diff --git a/toolkit/components/telemetry/Histograms.json b/toolkit/components/telemetry/Histograms.json
index 6c07c7107be..049a77064cd 100644
--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -71,6 +71,7 @@
     "description": "Maximum number of concurrent threads reached during a given download session"
   },
   "BLOCKLIST_SYNC_FILE_LOAD": {
+    "alert_emails": ["rvitillo@mozilla.com"],
     "expires_in_version": "35",
     "kind": "boolean",
     "description": "blocklist.xml has been loaded synchronously"
@@ -4183,6 +4184,7 @@
     "description": "Number of histograms with total count low errors"
   },
   "TELEMETRY_FILES_EVICTED": {
+    "alert_emails": ["rvitillo@mozilla.com"],
     "expires_in_version": "36",
     "kind": "enumerated",
     "n_values": 30,
@@ -4506,6 +4508,7 @@
     "description": "Time (ms) it takes to initialize the search service"
   },
   "SEARCH_SERVICE_INIT_SYNC": {
+    "alert_emails": ["rvitillo@mozilla.com"],
     "expires_in_version": "35",
     "kind": "boolean",
     "description": "search service has been initialized synchronously"
diff --git a/toolkit/components/telemetry/histogram_tools.py b/toolkit/components/telemetry/histogram_tools.py
index e66a733b229..9e07134487d 100644
--- a/toolkit/components/telemetry/histogram_tools.py
+++ b/toolkit/components/telemetry/histogram_tools.py
@@ -55,7 +55,7 @@ def exponential_buckets(dmin, dmax, n_buckets):
         ret_array[bucket_index] = current
     return ret_array
 
-always_allowed_keys = ['kind', 'description', 'cpp_guard', 'expires_in_version']
+always_allowed_keys = ['kind', 'description', 'cpp_guard', 'expires_in_version', "alert_emails"]
 
 class Histogram:
     """A class for representing a histogram definition."""