Add Splunk MultiMetric support

internal/config/config.go

@@ -1952,6 +1952,18 @@ func buildSerializer(name string, tbl *ast.Table) (serializers.Serializer, error
 		}
 	}
 
+	if node, ok := tbl.Fields["splunkmetric_multimetric"]; ok {
+		if kv, ok := node.(*ast.KeyValue); ok {
+			if b, ok := kv.Value.(*ast.Boolean); ok {
+				var err error
+				c.SplunkmetricMultiMetric, err = b.Boolean()
+				if err != nil {
+					return nil, err
+				}
+			}
+		}
+	}
+
 	if node, ok := tbl.Fields["wavefront_source_override"]; ok {
 		if kv, ok := node.(*ast.KeyValue); ok {
 			if ary, ok := kv.Value.(*ast.Array); ok {
@@ -1985,6 +1997,7 @@ func buildSerializer(name string, tbl *ast.Table) (serializers.Serializer, error
 	delete(tbl.Fields, "template")
 	delete(tbl.Fields, "json_timestamp_units")
 	delete(tbl.Fields, "splunkmetric_hec_routing")
+	delete(tbl.Fields, "splunkmetric_multimetric")
 	delete(tbl.Fields, "wavefront_source_override")
 	delete(tbl.Fields, "wavefront_use_strict")
 	return serializers.NewSerializer(c)

plugins/serializers/registry.go

@@ -73,6 +73,9 @@ type Config struct {
 	// Include HEC routing fields for splunkmetric output
 	HecRouting bool
 
+	// Enable Splunk MultiMetric output (Splunk 8.0+)
+	SplunkmetricMultiMetric bool
+
 	// Point tags to use as the source name for Wavefront (if none found, host will be used).
 	WavefrontSourceOverride []string
 
@@ -93,7 +96,7 @@ func NewSerializer(config *Config) (Serializer, error) {
 	case "json":
 		serializer, err = NewJsonSerializer(config.TimestampUnits)
 	case "splunkmetric":
-		serializer, err = NewSplunkmetricSerializer(config.HecRouting)
+		serializer, err = NewSplunkmetricSerializer(config.HecRouting, config.SplunkmetricMultiMetric)
 	case "nowmetric":
 		serializer, err = NewNowSerializer()
 	case "carbon2":
@@ -118,8 +121,8 @@ func NewCarbon2Serializer() (Serializer, error) {
 	return carbon2.NewSerializer()
 }
 
-func NewSplunkmetricSerializer(splunkmetric_hec_routing bool) (Serializer, error) {
-	return splunkmetric.NewSerializer(splunkmetric_hec_routing)
+func NewSplunkmetricSerializer(splunkmetric_hec_routing bool, splunkmetric_multimetric bool) (Serializer, error) {
+	return splunkmetric.NewSerializer(splunkmetric_hec_routing, splunkmetric_multimetric)
 }
 
 func NewNowSerializer() (Serializer, error) {

plugins/serializers/splunkmetric/README.md

@@ -27,6 +27,36 @@ In the above snippet, the following keys are dimensions:
 * dc
 * user
 
+## Using Multimetric output
+
+Starting with Splunk Enterprise and Splunk Cloud 8.0, you can now send multiple metric values in one payload. This means, for example, that
+you can send all of your CPU stats in one JSON struct, an example event looks like:
+
+```javascript
+{
+  "time": 1572469920,
+  "event": "metric",
+  "host": "mono.local",
+  "fields": {
+    "_config_hecRouting": false,
+    "_config_multiMetric": true,
+    "class": "osx",
+    "cpu": "cpu0",
+    "metric_name:telegraf.cpu.usage_guest": 0,
+    "metric_name:telegraf.cpu.usage_guest_nice": 0,
+    "metric_name:telegraf.cpu.usage_idle": 65.1,
+    "metric_name:telegraf.cpu.usage_iowait": 0,
+    "metric_name:telegraf.cpu.usage_irq": 0,
+    "metric_name:telegraf.cpu.usage_nice": 0,
+    "metric_name:telegraf.cpu.usage_softirq": 0,
+    "metric_name:telegraf.cpu.usage_steal": 0,
+    "metric_name:telegraf.cpu.usage_system": 10.2,
+    "metric_name:telegraf.cpu.usage_user": 24.7,
+  }
+}
+```
+In order to enable this mode, there's a new option `splunkmetric_multimetric` that you set in the appropriate output module you plan on using.
+
 ## Using with the HTTP output
 
 To send this data to a Splunk HEC, you can use the HTTP output, there are some custom headers that you need to add
@@ -61,6 +91,7 @@ to manage the HEC authorization, here's a sample config for an HTTP output:
    data_format = "splunkmetric"
     ## Provides time, index, source overrides for the HEC
    splunkmetric_hec_routing = true
+   # splunkmentric_multimetric = true
 
    ## Additional HTTP headers
     [outputs.http.headers]
@@ -118,7 +149,6 @@ disabled = false
 INDEXED_EXTRACTIONS = json
 KV_MODE = none
 TIMESTAMP_FIELDS = time
-TIME_FORMAT = %s.%3N
 ```
 
 An example configuration of a file based output is:
@@ -134,5 +164,6 @@ An example configuration of a file based output is:
    ## more about them here:
    ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
    data_format = "splunkmetric"
-   hec_routing = false
+   splunkmetric_hec_routing = false
+   splunkmetric_multimetric = true
 ```

plugins/serializers/splunkmetric/splunkmetric.go

@@ -9,12 +9,33 @@ import (
 )
 
 type serializer struct {
-	HecRouting bool
+	HecRouting              bool
+	SplunkmetricMultiMetric bool
 }
 
-func NewSerializer(splunkmetric_hec_routing bool) (*serializer, error) {
+type CommonTags struct {
+	Time   float64
+	Host   string
+	Index  string
+	Source string
+	Fields map[string]interface{}
+}
+
+type HECTimeSeries struct {
+	Time   float64                `json:"time"`
+	Event  string                 `json:"event"`
+	Host   string                 `json:"host,omitempty"`
+	Index  string                 `json:"index,omitempty"`
+	Source string                 `json:"source,omitempty"`
+	Fields map[string]interface{} `json:"fields"`
+}
+
+// NewSerializer Setup our new serializer
+func NewSerializer(splunkmetric_hec_routing bool, splunkmetric_multimetric bool) (*serializer, error) {
+	/*	Define output params */
 	s := &serializer{
-		HecRouting: splunkmetric_hec_routing,
+		HecRouting:              splunkmetric_hec_routing,
+		SplunkmetricMultiMetric: splunkmetric_multimetric,
 	}
 	return s, nil
 }
@@ -45,26 +66,61 @@ func (s *serializer) SerializeBatch(metrics []telegraf.Metric) ([]byte, error) {
 	return serialized, nil
 }
 
-func (s *serializer) createObject(metric telegraf.Metric) (metricGroup []byte, err error) {
+func (s *serializer) createMulti(metric telegraf.Metric, dataGroup HECTimeSeries, commonTags CommonTags) (metricGroup []byte, err error) {
+	/* When splunkmetric_multimetric is true, then we can write out multiple name=value pairs as part of the same
+	** event payload. This only works when the time, host, and dimensions are the same for every name=value pair
+	** in the timeseries data.
+	**
+	** The format for multimetric data is 'metric_name:nameOfMetric = valueOfMetric'
+	 */
+	var metricJSON []byte
+
+	// Set the event data from the commonTags above.
+	dataGroup.Event = "metric"
+	dataGroup.Time = commonTags.Time
+	dataGroup.Host = commonTags.Host
+	dataGroup.Index = commonTags.Index
+	dataGroup.Source = commonTags.Source
+	dataGroup.Fields = commonTags.Fields
+
+	// Stuff the metrid data into the structure.
+	for _, field := range metric.FieldList() {
+		value, valid := verifyValue(field.Value)
 
-	/*  Splunk supports one metric json object, and does _not_ support an array of JSON objects.
-	     ** Splunk has the following required names for the metric store:
-		 ** metric_name: The name of the metric
-		 ** _value:      The value for the metric
-		 ** time:       The timestamp for the metric
-		 ** All other index fields become dimensions.
-	*/
-	type HECTimeSeries struct {
-		Time   float64                `json:"time"`
-		Event  string                 `json:"event"`
-		Host   string                 `json:"host,omitempty"`
-		Index  string                 `json:"index,omitempty"`
-		Source string                 `json:"source,omitempty"`
-		Fields map[string]interface{} `json:"fields"`
+		if !valid {
+			log.Printf("D! Can not parse value: %v for key: %v", field.Value, field.Key)
+			continue
+		}
+
+		dataGroup.Fields["metric_name:"+metric.Name()+"."+field.Key] = value
 	}
 
-	dataGroup := HECTimeSeries{}
-	var metricJson []byte
+	// Manage the rest of the event details based upon HEC routing rules
+	switch s.HecRouting {
+	case true:
+		// Output the data as a fields array and host,index,time,source overrides for the HEC.
+		metricJSON, err = json.Marshal(dataGroup)
+	default:
+		// Just output the data and the time, useful for file based outuputs
+		dataGroup.Fields["time"] = dataGroup.Time
+		metricJSON, err = json.Marshal(dataGroup.Fields)
+	}
+	if err != nil {
+		return nil, err
+	}
+	// Let the JSON fall through to the return below
+	metricGroup = metricJSON
+
+	return metricGroup, nil
+}
+
+func (s *serializer) createSingle(metric telegraf.Metric, dataGroup HECTimeSeries, commonTags CommonTags) (metricGroup []byte, err error) {
+	/* The default mode is to generate one JSON entitiy per metric (required for pre-8.0 Splunks)
+	**
+	** The format for single metric is 'nameOfMetric = valueOfMetric'
+	 */
+
+	var metricJSON []byte
 
 	for _, field := range metric.FieldList() {
 
@@ -75,39 +131,30 @@ func (s *serializer) createObject(metric telegraf.Metric) (metricGroup []byte, e
 			continue
 		}
 
-		obj := map[string]interface{}{}
-		obj["metric_name"] = metric.Name() + "." + field.Key
-		obj["_value"] = value
-
 		dataGroup.Event = "metric"
-		// Convert ns to float seconds since epoch.
-		dataGroup.Time = float64(metric.Time().UnixNano()) / float64(1000000000)
-		dataGroup.Fields = obj
-
-		// Break tags out into key(n)=value(t) pairs
-		for n, t := range metric.Tags() {
-			if n == "host" {
-				dataGroup.Host = t
-			} else if n == "index" {
-				dataGroup.Index = t
-			} else if n == "source" {
-				dataGroup.Source = t
-			} else {
-				dataGroup.Fields[n] = t
-			}
-		}
+
+		dataGroup.Time = commonTags.Time
+
+		// Apply the common tags from above to every record.
+		dataGroup.Host = commonTags.Host
+		dataGroup.Index = commonTags.Index
+		dataGroup.Source = commonTags.Source
+		dataGroup.Fields = commonTags.Fields
+
+		dataGroup.Fields["metric_name"] = metric.Name() + "." + field.Key
+		dataGroup.Fields["_value"] = value
 
 		switch s.HecRouting {
 		case true:
 			// Output the data as a fields array and host,index,time,source overrides for the HEC.
-			metricJson, err = json.Marshal(dataGroup)
+			metricJSON, err = json.Marshal(dataGroup)
 		default:
 			// Just output the data and the time, useful for file based outuputs
 			dataGroup.Fields["time"] = dataGroup.Time
-			metricJson, err = json.Marshal(dataGroup.Fields)
+			metricJSON, err = json.Marshal(dataGroup.Fields)
 		}
 
-		metricGroup = append(metricGroup, metricJson...)
+		metricGroup = append(metricGroup, metricJSON...)
 
 		if err != nil {
 			return nil, err
@@ -117,6 +164,52 @@ func (s *serializer) createObject(metric telegraf.Metric) (metricGroup []byte, e
 	return metricGroup, nil
 }
 
+func (s *serializer) createObject(metric telegraf.Metric) (metricGroup []byte, err error) {
+
+	/*  Splunk supports one metric json object, and does _not_ support an array of JSON objects.
+	     ** Splunk has the following required names for the metric store:
+		 ** metric_name: The name of the metric
+		 ** _value:      The value for the metric
+		 ** time:       The timestamp for the metric
+		 ** All other index fields become dimensions.
+	*/
+
+	dataGroup := HECTimeSeries{}
+
+	// The tags are common to all events in this timeseries
+	commonTags := CommonTags{}
+
+	commonObj := map[string]interface{}{}
+
+	commonObj["config:hecRouting"] = s.HecRouting
+	commonObj["config:multiMetric"] = s.SplunkmetricMultiMetric
+
+	commonTags.Fields = commonObj
+
+	// Break tags out into key(n)=value(t) pairs
+	for n, t := range metric.Tags() {
+		if n == "host" {
+			commonTags.Host = t
+		} else if n == "index" {
+			commonTags.Index = t
+		} else if n == "source" {
+			commonTags.Source = t
+		} else {
+			commonTags.Fields[n] = t
+		}
+	}
+	commonTags.Time = float64(metric.Time().UnixNano()) / float64(1000000000)
+	switch s.SplunkmetricMultiMetric {
+	case true:
+		metricGroup, _ = s.createMulti(metric, dataGroup, commonTags)
+	default:
+		metricGroup, _ = s.createSingle(metric, dataGroup, commonTags)
+	}
+
+	// Return the metric group regardless of if it's multimetric or single metric.
+	return metricGroup, nil
+}
+
 func verifyValue(v interface{}) (value interface{}, valid bool) {
 	switch v.(type) {
 	case string: