Cloudwatch: Add af-south-1 region (#26513)

* Adds af-south-1 region to cloudwatch datasource

* Fix test

Co-authored-by: Sofia Papagiannaki <papagian@gmail.com>

pkg/tsdb/cloudwatch/metric_find_query.go

@@ -23,7 +23,7 @@ import (
 
 // Known AWS regions.
 var knownRegions = []string{
-	"ap-east-1", "ap-northeast-1", "ap-northeast-2", "ap-northeast-3", "ap-south-1", "ap-southeast-1",
+	"af-south-1", "ap-east-1", "ap-northeast-1", "ap-northeast-2", "ap-northeast-3", "ap-south-1", "ap-southeast-1",
 	"ap-southeast-2", "ca-central-1", "cn-north-1", "cn-northwest-1", "eu-central-1", "eu-north-1", "eu-west-1",
 	"eu-west-2", "eu-west-3", "me-south-1", "sa-east-1", "us-east-1", "us-east-2", "us-gov-east-1", "us-gov-west-1",
 	"us-iso-east-1", "us-isob-east-1", "us-west-1", "us-west-2",

pkg/tsdb/cloudwatch/metric_find_query_test.go

@@ -123,9 +123,10 @@ func TestCloudWatchMetrics(t *testing.T) {
 		result, err := executor.handleGetRegions(context.Background(), simplejson.New(), &tsdb.TsdbQuery{})
 		require.NoError(t, err)
 
-		assert.Equal(t, "ap-east-1", result[0].Text)
-		assert.Equal(t, "ap-northeast-1", result[1].Text)
-		assert.Equal(t, "ap-northeast-2", result[2].Text)
+		assert.Equal(t, "af-south-1", result[0].Text)
+		assert.Equal(t, "ap-east-1", result[1].Text)
+		assert.Equal(t, "ap-northeast-1", result[2].Text)
+		assert.Equal(t, "ap-northeast-2", result[3].Text)
 	})
 
 	t.Run("When calling handleGetEc2InstanceAttribute", func(t *testing.T) {

public/app/plugins/datasource/cloudwatch/components/ConfigEditor.tsx

@@ -70,6 +70,7 @@ export class ConfigEditor extends PureComponent<Props, State> {
         },
         (err: any) => {
           const regions = [
+            'af-south-1',
             'ap-east-1',
             'ap-northeast-1',
             'ap-northeast-2',