diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 000000000..518c5200b
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1 @@
+*  @guardian/mss-admins
diff --git a/notification/conf/notification.yaml b/notification/conf/notification.yaml
index 9083f70ee..98da9b287 100644
--- a/notification/conf/notification.yaml
+++ b/notification/conf/notification.yaml
@@ -380,7 +380,7 @@ Resources:
       Dimensions:
         - Name: LoadBalancerName
           Value: !Ref LoadBalancerToPrivateASG
-      EvaluationPeriods: 1
+      EvaluationPeriods: 10
       MetricName: HTTPCode_Backend_5XX
       Namespace: AWS/ELB
       Period: 60
@@ -398,7 +398,7 @@ Resources:
       Dimensions:
         - Name: LoadBalancerName
           Value: !Ref LoadBalancerToPrivateASG
-      EvaluationPeriods: 1
+      EvaluationPeriods: 10
       MetricName: HTTPCode_ELB_5XX
       Namespace: AWS/ELB
       Period: 60
diff --git a/notificationworkerlambda/cdk/lib/__snapshots__/senderworker.test.ts.snap b/notificationworkerlambda/cdk/lib/__snapshots__/senderworker.test.ts.snap
index 7d5f48a27..4fdc0780a 100644
--- a/notificationworkerlambda/cdk/lib/__snapshots__/senderworker.test.ts.snap
+++ b/notificationworkerlambda/cdk/lib/__snapshots__/senderworker.test.ts.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`The MobileAppsRendering stack matches the snapshot 1`] = `
+exports[`The Sender Worker stack matches the snapshot 1`] = `
 Object {
   "Metadata": Object {
     "gu:cdk:constructs": Array [],
@@ -512,7 +512,7 @@ Object {
     },
     "androidSenderTooFewInvocationsAlarmC306ECD5": Object {
       "Properties": Object {
-        "ActionsEnabled": false,
+        "ActionsEnabled": true,
         "AlarmActions": Array [
           Object {
             "Ref": "AlarmTopicArn",
@@ -536,7 +536,7 @@ Object {
             "Ref": "AlarmTopicArn",
           },
         ],
-        "Period": 360,
+        "Period": 3600,
         "Statistic": "Sum",
         "Threshold": 0,
         "TreatMissingData": "breaching",
@@ -982,7 +982,7 @@ Object {
     },
     "androidbetaSenderTooFewInvocationsAlarm7B50CD4B": Object {
       "Properties": Object {
-        "ActionsEnabled": false,
+        "ActionsEnabled": true,
         "AlarmActions": Array [
           Object {
             "Ref": "AlarmTopicArn",
@@ -1006,7 +1006,7 @@ Object {
             "Ref": "AlarmTopicArn",
           },
         ],
-        "Period": 360,
+        "Period": 3600,
         "Statistic": "Sum",
         "Threshold": 0,
         "TreatMissingData": "breaching",
@@ -1452,7 +1452,7 @@ Object {
     },
     "androideditionSenderTooFewInvocationsAlarmE4AB00FB": Object {
       "Properties": Object {
-        "ActionsEnabled": false,
+        "ActionsEnabled": true,
         "AlarmActions": Array [
           Object {
             "Ref": "AlarmTopicArn",
@@ -1476,7 +1476,7 @@ Object {
             "Ref": "AlarmTopicArn",
           },
         ],
-        "Period": 360,
+        "Period": 86400,
         "Statistic": "Sum",
         "Threshold": 0,
         "TreatMissingData": "breaching",
@@ -1922,7 +1922,7 @@ Object {
     },
     "iosSenderTooFewInvocationsAlarm14117FE9": Object {
       "Properties": Object {
-        "ActionsEnabled": false,
+        "ActionsEnabled": true,
         "AlarmActions": Array [
           Object {
             "Ref": "AlarmTopicArn",
@@ -1946,7 +1946,7 @@ Object {
             "Ref": "AlarmTopicArn",
           },
         ],
-        "Period": 360,
+        "Period": 3600,
         "Statistic": "Sum",
         "Threshold": 0,
         "TreatMissingData": "breaching",
@@ -2392,7 +2392,7 @@ Object {
     },
     "ioseditionSenderTooFewInvocationsAlarmD32BB28C": Object {
       "Properties": Object {
-        "ActionsEnabled": false,
+        "ActionsEnabled": true,
         "AlarmActions": Array [
           Object {
             "Ref": "AlarmTopicArn",
@@ -2416,7 +2416,7 @@ Object {
             "Ref": "AlarmTopicArn",
           },
         ],
-        "Period": 360,
+        "Period": 86400,
         "Statistic": "Sum",
         "Threshold": 0,
         "TreatMissingData": "breaching",
diff --git a/notificationworkerlambda/cdk/lib/senderworker.test.ts b/notificationworkerlambda/cdk/lib/senderworker.test.ts
index ea5f7e784..c51b80954 100644
--- a/notificationworkerlambda/cdk/lib/senderworker.test.ts
+++ b/notificationworkerlambda/cdk/lib/senderworker.test.ts
@@ -2,7 +2,7 @@ import { Template } from "aws-cdk-lib/assertions";
 import { App } from "aws-cdk-lib"
 import {SenderWorkerStack} from "./senderworker";
 
-describe('The MobileAppsRendering stack', () => {
+describe('The Sender Worker stack', () => {
   it('matches the snapshot', () => {
     const app = new App();
     const stack = new SenderWorkerStack(app, 'SenderWorkerStack', {
diff --git a/notificationworkerlambda/cdk/lib/senderworker.ts b/notificationworkerlambda/cdk/lib/senderworker.ts
index 4923415e8..56b1fb7f0 100644
--- a/notificationworkerlambda/cdk/lib/senderworker.ts
+++ b/notificationworkerlambda/cdk/lib/senderworker.ts
@@ -25,6 +25,7 @@ interface SenderWorkerOpts {
   platform: string,
   paramPrefix: string,
   isBatchingSqsMessages: boolean,
+  dailyAlarmPeriod: boolean
 }
 
 class SenderWorker extends cdkcore.Construct  {
@@ -152,9 +153,10 @@ class SenderWorker extends cdkcore.Construct  {
       comparisonOperator: cloudwatch.ComparisonOperator.LESS_THAN_OR_EQUAL_TO_THRESHOLD,
       evaluationPeriods: 1,
       threshold: 0,
-      metric: senderLambdaCtr.metricInvocations({period: cdk.Duration.seconds(360), statistic: "Sum"}),
+      // whole day for editions, 60 minutes for others
+      metric: senderLambdaCtr.metricInvocations({period: cdk.Duration.seconds(props.dailyAlarmPeriod ? 60 * 60 * 24 : 60 * 60), statistic: "Sum"}),
       treatMissingData: cloudwatch.TreatMissingData.BREACHING,
-      actionsEnabled: false // isEnabled
+      actionsEnabled: true // isEnabled
     })
     senderTooFewInvocationsAlarm.addAlarmAction(snsTopicAction)
     senderTooFewInvocationsAlarm.addOkAction(snsTopicAction)
@@ -217,14 +219,15 @@ export class SenderWorkerStack extends GuStack {
 
     let workerQueueArns: string[] = []
 
-    const addWorker = (workerName: string, paramPrefix: string, handler: string, isBatchingSqsMessages: boolean = false) => {
+    const addWorker = (workerName: string, paramPrefix: string, handler: string, isBatchingSqsMessages: boolean = false, dailyAlarmPeriod: boolean = false) => {
       let worker = new SenderWorker(this, workerName, {
         ...props,
         platform: workerName,
         paramPrefix: paramPrefix,
         handler: handler,
         isBatchingSqsMessages,
-        ...sharedOpts
+        ...sharedOpts,
+        dailyAlarmPeriod: dailyAlarmPeriod
       })
       workerQueueArns.push(worker.senderSqs.queueArn)
     }
@@ -236,8 +239,10 @@ export class SenderWorkerStack extends GuStack {
 
     addWorker("ios", "iosLive", "com.gu.notifications.worker.IOSSender::handleChunkTokens")
     addWorker("android", "androidLive", "com.gu.notifications.worker.AndroidSender::handleChunkTokens", true)
-    addWorker("ios-edition", "iosEdition", "com.gu.notifications.worker.IOSSender::handleChunkTokens")
-    addWorker("android-edition", "androidEdition", "com.gu.notifications.worker.AndroidSender::handleChunkTokens")
+        // edition apps only send one notification a day in order to get content for that day
+    addWorker("ios-edition", "iosEdition", "com.gu.notifications.worker.IOSSender::handleChunkTokens", false, true)
+    addWorker("android-edition", "androidEdition", "com.gu.notifications.worker.AndroidSender::handleChunkTokens", false, true)
+
     addWorker("android-beta", "androidBeta", "com.gu.notifications.worker.AndroidSender::handleChunkTokens")
 
     /*