fix(bigpanda): fields of alerting data point should be serialized as a string (#2596)

* fix(bigpanda): fields of alerting data point should be serialized as a string

* docs: update CHANGELOG.md

Author: bednar

CHANGELOG.md

@@ -8,7 +8,7 @@
 
 ### Bugfixes
 - [#2585](https://github.com/influxdata/kapacitor/pull/2585):Make DeleteGroupMessage align with GroupInfoer interface, thanks @prashanthjbabu!
-- [#2592](https://github.com/influxdata/kapacitor/pull/2592): Fix: payload serialization for BigPanda
+- [#2596](https://github.com/influxdata/kapacitor/pull/2596): Fix: payload serialization for BigPanda
 
 ## v1.6.0 [2021-06-28]
 

services/bigpanda/service.go

@@ -234,7 +234,16 @@ func (s *Service) preparePost(id string, message string, details string, level a
 	}
 
 	for k, v := range data.Fields {
-		bpData[k] = v
+		switch value := v.(type) {
+		case string:
+			bpData[k] = value
+		default:
+			b, err := json.Marshal(value)
+			if err != nil {
+				return nil, err
+			}
+			bpData[k] = string(b)
+		}
 	}
 
 	var post bytes.Buffer

services/bigpanda/service_test.go

@@ -21,15 +21,27 @@ func TestService_SerializeEventData(t *testing.T) {
 	}{
 		{
 			fields:  map[string]interface{}{"primitive_type": 10},
-			expBody: "{\"app_key\":\"key\",\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"primitive_type\":10,\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
+			expBody: "{\"app_key\":\"key\",\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"primitive_type\":\"10\",\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
+		},
+		{
+			fields:  map[string]interface{}{"primitive_type": "string"},
+			expBody: "{\"app_key\":\"key\",\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"primitive_type\":\"string\",\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
+		},
+		{
+			fields:  map[string]interface{}{"primitive_type": true},
+			expBody: "{\"app_key\":\"key\",\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"primitive_type\":\"true\",\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
+		},
+		{
+			fields:  map[string]interface{}{"primitive_type": 123.45},
+			expBody: "{\"app_key\":\"key\",\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"primitive_type\":\"123.45\",\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
 		},
 		{
 			fields:  map[string]interface{}{"escape": "\n"},
 			expBody: "{\"app_key\":\"key\",\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"escape\":\"\\n\",\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
 		},
 		{
 			fields:  map[string]interface{}{"array": []interface{}{10, true, "string value"}},
-			expBody: "{\"app_key\":\"key\",\"array\":[10,true,\"string value\"],\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
+			expBody: "{\"app_key\":\"key\",\"array\":\"[10,true,\\\"string value\\\"]\",\"check\":\"id\",\"description\":\"message\",\"details\":\"details\",\"status\":\"ok\",\"task\":\":test\",\"timestamp\":31536038}\n",
 		},
 	}