Add ability to specify bytes options as strings with units (KB, MiB, ...) (#4852)

plugins/outputs/influxdb/README.md

@@ -42,7 +42,7 @@ The InfluxDB output plugin writes metrics to the [InfluxDB v1.x] HTTP or UDP ser
   # user_agent = "telegraf"
 
   ## UDP payload size is the maximum packet size to send.
-  # udp_payload = 512
+  # udp_payload = "512B"
 
   ## Optional TLS Config for use on HTTP connections.
   # tls_ca = "/etc/telegraf/ca.pem"

plugins/outputs/influxdb/influxdb.go

@@ -41,7 +41,7 @@ type InfluxDB struct {
 	RetentionPolicy      string
 	WriteConsistency     string
 	Timeout              internal.Duration
-	UDPPayload           int               `toml:"udp_payload"`
+	UDPPayload           internal.Size     `toml:"udp_payload"`
 	HTTPProxy            string            `toml:"http_proxy"`
 	HTTPHeaders          map[string]string `toml:"http_headers"`
 	ContentEncoding      string            `toml:"content_encoding"`
@@ -95,7 +95,7 @@ var sampleConfig = `
   # user_agent = "telegraf"
 
   ## UDP payload size is the maximum packet size to send.
-  # udp_payload = 512
+  # udp_payload = "512B"
 
   ## Optional TLS Config for use on HTTP connections.
   # tls_ca = "/etc/telegraf/ca.pem"
@@ -225,7 +225,7 @@ func (i *InfluxDB) Write(metrics []telegraf.Metric) error {
 func (i *InfluxDB) udpClient(url *url.URL) (Client, error) {
 	config := &UDPConfig{
 		URL:            url,
-		MaxPayloadSize: i.UDPPayload,
+		MaxPayloadSize: int(i.UDPPayload.Size),
 		Serializer:     i.serializer,
 	}
 

plugins/outputs/influxdb/influxdb_test.go

@@ -74,7 +74,7 @@ func TestConnectUDPConfig(t *testing.T) {
 
 	output := influxdb.InfluxDB{
 		URLs:       []string{"udp://localhost:8089"},
-		UDPPayload: 42,
+		UDPPayload: internal.Size{Size: 42},
 
 		CreateUDPClientF: func(config *influxdb.UDPConfig) (influxdb.Client, error) {
 			actual = config