add instance id to default webhook template (#269)

Author: bwagner5

config/helm/aws-node-termination-handler/README.md

@@ -61,7 +61,7 @@ Parameter | Description | Default
 `webhookURLSecretName` | Pass Webhook URL as a secret. Secret Key: `webhookurl`, Value: `<WEBHOOK_URL>` | None
 `webhookProxy` | Uses the specified HTTP(S) proxy for sending webhooks | ``
 `webhookHeaders` | Replaces the default webhook headers. | `{"Content-type":"application/json"}`
-`webhookTemplate` | Replaces the default webhook message template. | `{"text":"[NTH][Instance Interruption] EventID: {{ .EventID }} - Kind: {{ .Kind }} - Description: {{ .Description }} - State: {{ .State }} - Start Time: {{ .StartTime }}"}`
+`webhookTemplate` | Replaces the default webhook message template. | `{"text":"[NTH][Instance Interruption] EventID: {{ .EventID }} - Kind: {{ .Kind }} - Instance: {{ .InstanceID }} - Description: {{ .Description }} - Start Time: {{ .StartTime }}"}`
 `webhookTemplateConfigMapName` | Pass Webhook template file as configmap | None
 `webhookTemplateConfigMapKey` | Name of the template file stored in the configmap| None
 `enableScheduledEventDraining` | [EXPERIMENTAL] If true, drain nodes before the maintenance window starts for an EC2 instance scheduled event | `false`

pkg/config/config.go

@@ -47,7 +47,7 @@ const (
 	webhookHeadersDefault                   = `{"Content-type":"application/json"}`
 	webhookTemplateConfigKey                = "WEBHOOK_TEMPLATE"
 	webhookTemplateFileConfigKey            = "WEBHOOK_TEMPLATE_FILE"
-	webhookTemplateDefault                  = `{"text":"[NTH][Instance Interruption] EventID: {{ .EventID }} - Kind: {{ .Kind }} - Description: {{ .Description }} - Start Time: {{ .StartTime }}"}`
+	webhookTemplateDefault                  = `{"text":"[NTH][Instance Interruption] EventID: {{ .EventID }} - Kind: {{ .Kind }} - Instance: {{ .InstanceID }} - Description: {{ .Description }} - Start Time: {{ .StartTime }}"}`
 	enableScheduledEventDrainingConfigKey   = "ENABLE_SCHEDULED_EVENT_DRAINING"
 	enableScheduledEventDrainingDefault     = false
 	enableSpotInterruptionDrainingConfigKey = "ENABLE_SPOT_INTERRUPTION_DRAINING"