feat: add timeout-setting to Graylog-plugin (#10220)

plugins/inputs/graylog/README.md

@@ -30,6 +30,9 @@ Note: if namespace end point specified metrics array will be ignored for that ca
     "http://[graylog-server-ip]:12900/system/metrics/multiple",
   ]
 
+  ## Set timeout (default 5 seconds)
+  # timeout = "5s"
+
   ## Metrics list
   ## List of metrics can be found on Graylog webservice documentation.
   ## Or by hitting the web service api at:

plugins/inputs/graylog/graylog.go

@@ -14,6 +14,7 @@ import (
 	"time"
 
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/plugins/common/tls"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
@@ -34,6 +35,7 @@ type GrayLog struct {
 	Metrics  []string
 	Username string
 	Password string
+	Timeout  config.Duration
 	tls.ClientConfig
 
 	client HTTPClient
@@ -89,6 +91,9 @@ var sampleConfig = `
     "http://[graylog-server-ip]:12900/system/metrics/multiple",
   ]
 
+  ## Set timeout (default 5 seconds)
+  # timeout = "5s"
+
   ## Metrics list
   ## List of metrics can be found on Graylog webservice documentation.
   ## Or by hitting the the web service api at:
@@ -128,12 +133,12 @@ func (h *GrayLog) Gather(acc telegraf.Accumulator) error {
 			return err
 		}
 		tr := &http.Transport{
-			ResponseHeaderTimeout: 3 * time.Second,
+			ResponseHeaderTimeout: time.Duration(h.Timeout),
 			TLSClientConfig:       tlsCfg,
 		}
 		client := &http.Client{
 			Transport: tr,
-			Timeout:   4 * time.Second,
+			Timeout:   time.Duration(h.Timeout),
 		}
 		h.client.SetHTTPClient(client)
 	}
@@ -285,7 +290,8 @@ func (h *GrayLog) sendRequest(serverURL string) (string, float64, error) {
 func init() {
 	inputs.Add("graylog", func() telegraf.Input {
 		return &GrayLog{
-			client: &RealHTTPClient{},
+			client:  &RealHTTPClient{},
+			Timeout: config.Duration(5 * time.Second),
 		}
 	})
 }