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Wavefront output plugin #2288

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# Wavefront Output Plugin
This plugin writes to a [Wavefront]( proxy, in Wavefront data format over TCP.
## Wavefront Data format
The expected input for Wavefront is specified in the following way:
<metric> <value> [<timestamp>] <source|host>=<soureTagValue> [tagk1=tagv1 ...tagkN=tagvN]
More information about the Wavefront data format is available [here](
By default, to ease Metrics browsing in the Wavefront UI, metrics are grouped by converting any `_` characters to `.` in the final name.
This behavior can be altered by changing the `metric_separator` and/or the `convert_paths` settings.
Most illegal characters in the metric name are automatically converted to `-`.
The `use_regex` setting can be used to ensure all illegal characters are properly handled, but can lead to performance degradation.
## Configuration:
# Configuration for Wavefront output
## prefix for metrics keys
prefix = "my.specific.prefix."
## DNS name of the wavefront proxy server
host = ""
## Port that the Wavefront proxy server listens on
port = 2878
## wether to use "value" for name of simple fields
simple_fields = false
## character to use between metric and field name. defaults to . (dot)
metric_separator = "."
## Convert metric name paths to use metricSeperator character
## When true (default) will convert all _ (underscore) chartacters in final metric name
convert_paths = true
## Use Regex to sanitize metric and tag names from invalid characters
## Regex is more thorough, but significantly slower
use_regex = false
## point tags to use as the source name for Wavefront (if none found, host will be used)
source_override = ["hostname", "snmp_host", "node_host"]
## whether to convert boolean values to numeric values, with false -> 0.0 and true -> 1.0. default true
convert_bool = true
## Define a mapping, namespaced by metric prefix, from string values to numeric values
## The example below maps "green" -> 1.0, "yellow" -> 0.5, "red" -> 0.0 for
## any metrics beginning with "elasticsearch"
green = 1.0
yellow = 0.5
red = 0.0
## Print additional debug information requires debug = true at the agent level
debug_all = false
Prefix string
Host string
Port int
SimpleFields bool
MetricSeparator string
ConvertPaths bool
ConvertBool bool
UseRegex bool
SourceOverride []string
StringToNumber map[string][]map[string]float64
DebugAll bool
* `prefix`: String to use as a prefix for all sent metrics.
* `host`: Name of Wavefront proxy server
* `port`: Port that Wavefront proxy server is configured for `pushListenerPorts`
* `simple_fields`: if false (default) metric field names called `value` are converted to empty strings
* `metric_separator`: character to use to separate metric and field names. (default is `_`)
* `convert_paths`: if true (default) will convert all `_` in metric and field names to `metric_seperator`
* `convert_bool`: if true (default) will convert all boolean metric values to numbers, t->1.0, f->0.0
* `use_regex`: if true (default is false) will use regex to ensure all illegal characters are converted to `-`. Regex is much slower than the default mode which will catch most illegal characters. Use with caution.
* `source_override`: ordered list of point tags to use as the source name for Wavefront. Once a match is found, that tag is used as the source for that point. If no tags are found the host tag will be used.
* `string_to_number`: config structure that controls how certain string values are mapped to numeric values for particular
metric namespaces. See example above.
* `debug_all`: Will output additional debug information. Requires `debug = true` to be configured at the agent level
The Wavefront proxy interface can be simulated with this reader:
// wavefront_proxy_mock.go
package main
import (
func main() {
l, err := net.Listen("tcp", "localhost:2878")
if err != nil {
defer l.Close()
for {
conn, err := l.Accept()
if err != nil {
go func(c net.Conn) {
defer c.Close()
io.Copy(os.Stdout, c)
## Allowed values for metrics
Wavefront allows `integers` and `floats` as input values. It will ignore most `strings`, but when configured
will map certain `strings` to numeric values. By default it also maps `bool` values to numeric, false -> 0.0,
true -> 1.0
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