HTTP alerting

src/metrics-alerting/alert/http.go

 package alert
 
 import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+
 	"metrics-alerting/config"
 )
 
+type alertBody struct {
+	Key   string `json:"scriptKey"`
+	Value string `json:"value"`
+}
+
 func alertHttp(script config.Script, result interface{}) error {
-	return nil
+	alert := alertBody{
+		Key:   script.Key,
+		Value: result,
+	}
+
+	body, err := json.Marshal(alert)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequest("POST", script.Target, bytes.NewBuffer(body))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	client := http.Client{}
+	resp, err := client.Do(req)
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf(
+			"target %s returned non-200 status code %d", script.Target, resp.StatusCode
+		)
+	}
+
+	return err
 }