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feat: Enable unhealthy instance alarm for registration and report #1712

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Merged
akash1810 merged 1 commit into from
Feb 27, 2026
+494 −7
Merged

feat: Enable unhealthy instance alarm for registration and report #1712

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240 changes: 240 additions & 0 deletions cdk/lib/__snapshots__/registration.test.ts.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ exports[`The Registration stack matches the snapshot for CODE 1`] = `
"GuAccessLoggingBucketParameter",
"GuApplicationTargetGroup",
"GuHttpsApplicationListener",
"GuUnhealthyInstancesAlarm",
"GuParameter",
"GuCname",
],
Expand Down Expand Up @@ -973,6 +974,125 @@ exports[`The Registration stack matches the snapshot for CODE 1`] = `
},
"Type": "AWS::ElasticLoadBalancingV2::TargetGroup",
},
"UnhealthyInstancesAlarmRegistration921377C3": {
"Properties": {
"ActionsEnabled": true,
"AlarmActions": [
{
"Fn::Join": [
"",
[
"arn:aws:sns:eu-west-1:",
{
"Ref": "AWS::AccountId",
},
":mobile-server-side",
],
],
},
],
"AlarmDescription": "registration's instances have failed healthchecks several times over the last 1 hour.
This typically results in the AutoScaling Group cycling instances and can lead to problems with deployment,
scaling or handling traffic spikes.

Check registration's application logs or ssh onto an unhealthy instance in order to debug these problems.",
"AlarmName": "Unhealthy instances for registration in CODE",
"ComparisonOperator": "GreaterThanOrEqualToThreshold",
"DatapointsToAlarm": 30,
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": {
"Fn::Join": [
"",
[
{
"Fn::Select": [
1,
{
"Fn::Split": [
"/",
{
"Ref": "ListenerRegistration1652F707",
},
],
},
],
},
"/",
{
"Fn::Select": [
2,
{
"Fn::Split": [
"/",
{
"Ref": "ListenerRegistration1652F707",
},
],
},
],
},
"/",
{
"Fn::Select": [
3,
{
"Fn::Split": [
"/",
{
"Ref": "ListenerRegistration1652F707",
},
],
},
],
},
],
],
},
},
{
"Name": "TargetGroup",
"Value": {
"Fn::GetAtt": [
"TargetGroupRegistrationF8D1F3E9",
"TargetGroupFullName",
],
},
},
],
"EvaluationPeriods": 60,
"MetricName": "UnHealthyHostCount",
"Namespace": "AWS/ApplicationELB",
"Period": 60,
"Statistic": "Maximum",
"Tags": [
{
"Key": "App",
"Value": "registration",
},
{
"Key": "gu:cdk:version",
"Value": "TEST",
},
{
"Key": "gu:repo",
"Value": "guardian/mobile-n10n",
},
{
"Key": "Stack",
"Value": "mobile-notifications",
},
{
"Key": "Stage",
"Value": "CODE",
},
],
"Threshold": 1,
"TreatMissingData": "notBreaching",
},
"Type": "AWS::CloudWatch::Alarm",
},
"mobilenotificationsCODEregistration504D3B6F": {
"DependsOn": [
"InstanceRoleRegistrationF217DF71",
Expand Down Expand Up @@ -1161,6 +1281,7 @@ exports[`The Registration stack matches the snapshot for PROD 1`] = `
"GuAccessLoggingBucketParameter",
"GuApplicationTargetGroup",
"GuHttpsApplicationListener",
"GuUnhealthyInstancesAlarm",
"GuParameter",
"GuCname",
],
Expand Down Expand Up @@ -2108,6 +2229,125 @@ exports[`The Registration stack matches the snapshot for PROD 1`] = `
},
"Type": "AWS::ElasticLoadBalancingV2::TargetGroup",
},
"UnhealthyInstancesAlarmRegistration921377C3": {
"Properties": {
"ActionsEnabled": true,
"AlarmActions": [
{
"Fn::Join": [
"",
[
"arn:aws:sns:eu-west-1:",
{
"Ref": "AWS::AccountId",
},
":mobile-server-side",
],
],
},
],
"AlarmDescription": "registration's instances have failed healthchecks several times over the last 1 hour.
This typically results in the AutoScaling Group cycling instances and can lead to problems with deployment,
scaling or handling traffic spikes.

Check registration's application logs or ssh onto an unhealthy instance in order to debug these problems.",
"AlarmName": "Unhealthy instances for registration in PROD",
"ComparisonOperator": "GreaterThanOrEqualToThreshold",
"DatapointsToAlarm": 30,
"Dimensions": [
{
"Name": "LoadBalancer",
"Value": {
"Fn::Join": [
"",
[
{
"Fn::Select": [
1,
{
"Fn::Split": [
"/",
{
"Ref": "ListenerRegistration1652F707",
},
],
},
],
},
"/",
{
"Fn::Select": [
2,
{
"Fn::Split": [
"/",
{
"Ref": "ListenerRegistration1652F707",
},
],
},
],
},
"/",
{
"Fn::Select": [
3,
{
"Fn::Split": [
"/",
{
"Ref": "ListenerRegistration1652F707",
},
],
},
],
},
],
],
},
},
{
"Name": "TargetGroup",
"Value": {
"Fn::GetAtt": [
"TargetGroupRegistrationF8D1F3E9",
"TargetGroupFullName",
],
},
},
],
"EvaluationPeriods": 60,
"MetricName": "UnHealthyHostCount",
"Namespace": "AWS/ApplicationELB",
"Period": 60,
"Statistic": "Maximum",
"Tags": [
{
"Key": "App",
"Value": "registration",
},
{
"Key": "gu:cdk:version",
"Value": "TEST",
},
{
"Key": "gu:repo",
"Value": "guardian/mobile-n10n",
},
{
"Key": "Stack",
"Value": "mobile-notifications",
},
{
"Key": "Stage",
"Value": "PROD",
},
],
"Threshold": 1,
"TreatMissingData": "notBreaching",
},
"Type": "AWS::CloudWatch::Alarm",
},
"mobilenotificationsPRODregistration32DCD2DE": {
"DependsOn": [
"InstanceRoleRegistrationF217DF71",
Expand Down
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