add overwrite tags for Riemann

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Features
 
+- [#1845](https://github.com/influxdata/telegraf/pull/1845): Send measurement as Riemann tag, add overwrite tags.
 - [#1782](https://github.com/influxdata/telegraf/pull/1782): Allow numeric and non-string values for tag_keys.
 - [#1694](https://github.com/influxdata/telegraf/pull/1694): Adding Gauge and Counter metric types.
 - [#1606](https://github.com/influxdata/telegraf/pull/1606): Remove carraige returns from exec plugin output on Windows
@@ -29,6 +30,7 @@
 
 ### Bugfixes
 
+- [#1501](https://github.com/influxdata/telegraf/issues/1501): Send metric tags as Riemann tags and attributes.
 - [#1746](https://github.com/influxdata/telegraf/issues/1746): Fix handling of non-string values for JSON keys listed in tag_keys.
 - [#1628](https://github.com/influxdata/telegraf/issues/1628): Fix mongodb input panic on version 2.2.
 - [#1733](https://github.com/influxdata/telegraf/issues/1733): Fix statsd scientific notation parsing

etc/telegraf.conf

@@ -440,7 +440,8 @@
 #   separator = " "
 #   ## set measurement name as a Riemann tag instead of prepending it to the Riemann service name
 #   measurement_as_tag = false
-
+#   ## list of Riemann tags, if specified use these instead of any Telegraf tags
+#   tags = ["telegraf","custom_tag"]
 
 
 ###############################################################################

plugins/outputs/riemann/riemann.go

@@ -16,6 +16,7 @@ type Riemann struct {
 	Transport        string
 	Separator        string
 	MeasurementAsTag bool
+	Tags             []string
 
 	client *raidman.Client
 }
@@ -29,6 +30,8 @@ var sampleConfig = `
   separator = " "
   ## set measurement name as a Riemann tag instead of prepending it to the Riemann service name
   measurement_as_tag = false
+  ## list of Riemann tags, if specified use these instead of any Telegraf tags
+  tags = ["telegraf","custom_tag"]
 `
 
 func (r *Riemann) Connect() error {
@@ -107,7 +110,7 @@ func (r *Riemann) buildEvents(p telegraf.Metric) []*raidman.Event {
 			Host:       host,
 			Service:    r.service(p.Name(), fieldName),
 			Tags:       r.tags(p.Name(), p.Tags()),
-			Attributes: p.Tags(),
+			Attributes: r.attributes(p.Name(), p.Tags()),
 			Time:       p.Time().Unix(),
 		}
 
@@ -125,7 +128,18 @@ func (r *Riemann) buildEvents(p telegraf.Metric) []*raidman.Event {
 	return events
 }
 
+func (r *Riemann) attributes(name string, tags map[string]string) map[string]string {
+	if r.MeasurementAsTag {
+		tags["measurement"] = name
+	}
+	return tags
+}
+
 func (r *Riemann) tags(name string, tags map[string]string) []string {
+	if len(r.Tags) > 0 {
+		return r.Tags
+	}
+
 	var tagNames, tagValues []string
 
 	for tagName := range tags {