Stack: support configurable log retention days.

Author: grahamc

templates/aws-stack.yml

@@ -49,6 +49,7 @@ Metadata:
         - BuildkiteWindowsAdministrator
         - BuildkiteAgentScalerServerlessARN
         - BuildkiteAgentScalerVersion
+        - LogRetentionDays
 
       - Label:
           default: Network Configuration
@@ -187,6 +188,11 @@ Parameters:
     Type: String
     Default: "1.7.0"
 
+  LogRetentionDays:
+    Type: Number
+    Description: The number of days to retain the Cloudwatch Logs of the lambda.
+    Default: "1"
+
   BuildkiteAgentTracingBackend:
     Description: The tracing backend to use for CI tracing. See https://buildkite.com/docs/agent/v3/tracing
     Type: String
@@ -1434,3 +1440,4 @@ Resources:
         ScaleOutForWaitingJobs: !Ref ScaleOutForWaitingJobs
         EventSchedulePeriod: !Ref ScalerEventSchedulePeriod
         MinPollInterval: !Ref ScalerMinPollInterval
+        LogRetentionDays: !Ref LogRetentionDays