Merge pull request #320 from NHSDigital/bugfix/eja-eli-304-amend-eventbridge-template

eli-304 changing eventbridge format to single line

Author: eddalmond1

infrastructure/stacks/api-layer/eventbridge.tf

@@ -73,21 +73,7 @@ resource "aws_cloudwatch_event_target" "firehose_target" {
       reason     = "$.detail.state.reason"
     }
 
-    # Use a heredoc string so EventBridge placeholders like <time> are not JSON-escaped
-    # (jsonencode would turn < and > into \u003c/\u003e, preventing substitution).
-    input_template = <<TEMPLATE
-{
-  "time": "<time>",
-  "source": "elid-${var.environment}:cloudwatch:alarm",
-  "sourcetype": "aws:cloudwatch:alarm",
-  "event": {
-    "alarm_name": "<alarm_name>",
-    "new_state": "<new_state>",
-    "old_state": "<old_state>",
-    "reason": "<reason>",
-    "region": "<region>"
-  }
-}
-TEMPLATE
+    # Eventbridge + Firehose splits events if we don't put on single line
+    input_template = "\"{ \\\"time\\\": \\\"<time>\\\", \\\"source\\\": \\\"elid-${var.environment}:cloudwatch:alarm\\\", \\\"sourcetype\\\": \\\"aws:cloudwatch:alarm\\\", \\\"event\\\": { \\\"alarm_name\\\": \\\"<alarm_name>\\\", \\\"new_state\\\": \\\"<new_state>\\\", \\\"old_state\\\": \\\"<old_state>\\\", \\\"reason\\\": \\\"<reason>\\\", \\\"region\\\": \\\"<region>\\\" } }\""
   }
 }