get region list from ec2:DescribeRegions

pkg/tsdb/cloudwatch/metric_find_query.go

@@ -234,10 +234,22 @@ func parseMultiSelectValue(input string) []string {
 // Please update the region list in public/app/plugins/datasource/cloudwatch/partials/config.html
 func (e *CloudWatchExecutor) handleGetRegions(ctx context.Context, parameters *simplejson.Json, queryContext *tsdb.TsdbQuery) ([]suggestData, error) {
 	regions := []string{
-		"ap-northeast-1", "ap-northeast-2", "ap-southeast-1", "ap-southeast-2", "ap-south-1", "ca-central-1", "cn-north-1", "cn-northwest-1",
-		"eu-central-1", "eu-west-1", "eu-west-2", "eu-west-3", "sa-east-1", "us-east-1", "us-east-2", "us-gov-west-1", "us-west-1", "us-west-2", "us-isob-east-1", "us-iso-east-1",
+		"cn-north-1", "cn-northwest-1", "us-gov-west-1", "us-isob-east-1", "us-iso-east-1",
 	}
 
+	err := e.ensureClientSession("us-east-1")
+	if err != nil {
+		return nil, err
+	}
+	r, err := e.ec2Svc.DescribeRegions(&ec2.DescribeRegionsInput{})
+	if err != nil {
+		return nil, err
+	}
+	for _, region := range r.Regions {
+		regions = append(regions, *region.RegionName)
+	}
+	sort.Strings(regions)
+
 	result := make([]suggestData, 0)
 	for _, region := range regions {
 		result = append(result, suggestData{Text: region, Value: region})