Add support for configuring an AWS endpoint_url (#4485)

plugins/inputs/cloudwatch/README.md

@@ -35,6 +35,12 @@ API endpoint. In the following order the plugin will attempt to authenticate.
   #profile = ""
   #shared_credential_file = ""
 
+  ## Endpoint to make request against, the correct endpoint is automatically
+  ## determined and this option should only be set if you wish to override the
+  ## default.
+  ##   ex: endpoint_url = "http://localhost:8000"
+  # endpoint_url = ""
+
   # The minimum period for Cloudwatch metrics is 1 minute (60s). However not all
   # metrics are made available to the 1 minute period. Some are collected at
   # 3 minute, 5 minute, or larger intervals. See https://aws.amazon.com/cloudwatch/faqs/#monitoring.

plugins/inputs/cloudwatch/cloudwatch.go

@@ -19,13 +19,14 @@ import (
 
 type (
 	CloudWatch struct {
-		Region    string `toml:"region"`
-		AccessKey string `toml:"access_key"`
-		SecretKey string `toml:"secret_key"`
-		RoleARN   string `toml:"role_arn"`
-		Profile   string `toml:"profile"`
-		Filename  string `toml:"shared_credential_file"`
-		Token     string `toml:"token"`
+		Region      string `toml:"region"`
+		AccessKey   string `toml:"access_key"`
+		SecretKey   string `toml:"secret_key"`
+		RoleARN     string `toml:"role_arn"`
+		Profile     string `toml:"profile"`
+		Filename    string `toml:"shared_credential_file"`
+		Token       string `toml:"token"`
+		EndpointURL string `toml:"endpoint_url"`
 
 		Period      internal.Duration `toml:"period"`
 		Delay       internal.Duration `toml:"delay"`
@@ -79,6 +80,12 @@ func (c *CloudWatch) SampleConfig() string {
   #profile = ""
   #shared_credential_file = ""
 
+  ## Endpoint to make request against, the correct endpoint is automatically
+  ## determined and this option should only be set if you wish to override the
+  ## default.
+  ##   ex: endpoint_url = "http://localhost:8000"
+  # endpoint_url = ""
+
   # The minimum period for Cloudwatch metrics is 1 minute (60s). However not all
   # metrics are made available to the 1 minute period. Some are collected at
   # 3 minute, 5 minute, or larger intervals. See https://aws.amazon.com/cloudwatch/faqs/#monitoring.
@@ -224,13 +231,14 @@ func init() {
  */
 func (c *CloudWatch) initializeCloudWatch() error {
 	credentialConfig := &internalaws.CredentialConfig{
-		Region:    c.Region,
-		AccessKey: c.AccessKey,
-		SecretKey: c.SecretKey,
-		RoleARN:   c.RoleARN,
-		Profile:   c.Profile,
-		Filename:  c.Filename,
-		Token:     c.Token,
+		Region:      c.Region,
+		AccessKey:   c.AccessKey,
+		SecretKey:   c.SecretKey,
+		RoleARN:     c.RoleARN,
+		Profile:     c.Profile,
+		Filename:    c.Filename,
+		Token:       c.Token,
+		EndpointURL: c.EndpointURL,
 	}
 	configProvider := credentialConfig.Credentials()