fix(parsers.avro): Do not force addition of timestamp as a field

plugins/parsers/avro/parser.go

@@ -172,24 +172,6 @@ func (p *Parser) createMetric(data map[string]interface{}, schema string) (teleg
 		// If you have specified your fields in the config, you
 		// get what you asked for.
 		fieldList = p.Fields
-
-		// Except...if you specify the timestamp field, and it's
-		// not listed in your fields, you'll get it anyway.
-		// This will randomize your field ordering, which isn't
-		// ideal.  If you care, list the timestamp field.
-		if p.Timestamp != "" {
-			// quick list-to-set-to-list implementation
-			fieldSet := make(map[string]bool)
-			for k := range fieldList {
-				fieldSet[fieldList[k]] = true
-			}
-			fieldSet[p.Timestamp] = true
-			var newList []string
-			for s := range fieldSet {
-				newList = append(newList, s)
-			}
-			fieldList = newList
-		}
 	} else {
 		for k := range data {
 			// Otherwise, that which is not a tag is a field
@@ -255,7 +237,7 @@ func (p *Parser) createMetric(data map[string]interface{}, schema string) (teleg
 	}
 	var timestamp time.Time
 	if p.Timestamp != "" {
-		rawTime := fmt.Sprintf("%v", fields[p.Timestamp])
+		rawTime := fmt.Sprintf("%v", data[p.Timestamp])
 		var err error
 		timestamp, err = internal.ParseTimestamp(p.TimestampFormat, rawTime, nil)
 		if err != nil {

plugins/parsers/avro/testdata/json-format/message.json

@@ -4,4 +4,4 @@
     "up_time": 1166984904,
     "cpu_utilization": 14.0,
     "memory_utilization": 20.0
-}
+}

plugins/parsers/avro/testdata/json-format/telegraf.conf

@@ -5,7 +5,7 @@
   avro_format = "json"
   avro_measurement = "Switch"
   avro_tags = ["switch_wwn"]
-  avro_fields = ["up_time", "cpu_utilization", "memory_utilization"]
+  avro_fields = ["up_time", "cpu_utilization", "memory_utilization", "statistics_collection_time"]
   avro_timestamp = "statistics_collection_time"
   avro_timestamp_format = "unix_ms"
   avro_schema = '''
@@ -22,4 +22,4 @@
                         {"name": "memory_utilization", "type": "float", "default": 0, "doc": "Memory Utilization in %"}
                 ]
         }
-  '''
+  '''

plugins/parsers/avro/testdata/supplied_timestamp_fields_unspecified/expected.out

@@ -1 +1 @@
-measurement,tag=test_tag field=19i,timestamp=1664296121000000i 1664296121000000
+measurement,tag=test_tag field=19i 1664296121000000

plugins/parsers/avro/testdata/supplied_timestamp_fields_unspecified/telegraf.conf

@@ -4,8 +4,6 @@
   avro_measurement = "measurement"
   avro_tags = [ "tag" ]
   avro_fields = [ "field" ]
-  avro_timestamp = "timestamp"
-  avro_timestamp_format = "unix_us"
   avro_schema = '''
 {
   "type":"record",
@@ -19,10 +17,6 @@
       {
 	  "name":"field",
 	  "type":"long"
-      },
-      {
-	  "name":"timestamp",
-	  "type":"long"
       }
   ]
 }