--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -72,31 +72,31 @@
   },
   "APPLICATION_REPUTATION_SERVER": {
     "expires_in_version": "never",
     "kind": "enumerated",
     "n_values": 3,
     "description": "Application reputation remote status (0=OK, 1=FAIL, 2=INVALID)"
   },
   "APPLICATION_REPUTATION_SERVER_VERDICT": {
-    "expires_in_version": "52",
+    "expires_in_version": "56",
     "releaseChannelCollection": "opt-out",
     "bug_numbers": [1272788],
     "kind": "enumerated",
     "n_values": 8,
     "description": "Application reputation remote response (0=SAFE, 1=DANGEROUS, 2=UNCOMMON, 3=POTENTIALLY_UNWANTED, 4=DANGEROUS_HOST)"
   },
   "APPLICATION_REPUTATION_COUNT": {
     "expires_in_version": "never",
     "kind": "boolean",
     "description": "Application reputation query count (both local and remote)"
   },
   "APPLICATION_REPUTATION_REMOTE_LOOKUP_TIMEOUT": {
     "alert_emails": ["gcp@mozilla.com", "francois@mozilla.com"],
-    "expires_in_version": "55",
+    "expires_in_version": "56",
     "kind": "boolean",
     "bug_numbers": [1172689],
     "description": "Recorded when application reputation remote lookup is performed, `true` is recorded if the lookup times out."
   },
   "AUDIOSTREAM_FIRST_OPEN_MS": {
     "expires_in_version": "50",
     "kind": "exponential",
     "high": 10000,
@@ -3621,17 +3621,17 @@
   "URLCLASSIFIER_PS_FILELOAD_TIME": {
     "expires_in_version": "never",
     "kind": "exponential",
     "high": 1000,
     "n_buckets": 10,
     "description": "Time spent loading PrefixSet from file (ms)"
   },
   "URLCLASSIFIER_PS_FALLOCATE_TIME": {
-    "expires_in_version": "default",
+    "expires_in_version": "never",
     "kind": "exponential",
     "high": 1000,
     "n_buckets": 10,
     "description": "Time spent fallocating PrefixSet (ms)"
   },
   "URLCLASSIFIER_PS_CONSTRUCT_TIME": {
     "expires_in_version": "never",
     "kind": "exponential",
@@ -3666,17 +3666,17 @@
     "expires_in_version": "never",
     "kind": "enumerated",
     "n_values": 16,
     "bug_numbers": [1150921],
     "description": "Server HTTP status code from remote SafeBrowsing gethash lookups. (0=1xx, 1=200, 2=2xx, 3=204, 4=3xx, 5=400, 6=4xx, 7=403, 8=404, 9=408, 10=413, 11=5xx, 12=502|504|511, 13=503, 14=505, 15=Other)"
   },
   "URLCLASSIFIER_COMPLETE_TIMEOUT": {
     "alert_emails": ["gcp@mozilla.com", "francois@mozilla.com"],
-    "expires_in_version": "52",
+    "expires_in_version": "56",
     "kind": "boolean",
     "bug_numbers": [1172688],
     "description": "This metric is recorded every time a gethash lookup is performed, `true` is recorded if the lookup times out."
   },
   "CSP_DOCUMENTS_COUNT": {
     "alert_emails": ["seceng@mozilla.com"],
     "bug_numbers": [1252829],
     "expires_in_version": "55",