make dumper work

pkg/poller/inputs.go

@@ -17,6 +17,7 @@ var (
 type Input interface {
 	Initialize(Logger) error    // Called once on startup to initialize the plugin.
 	Metrics() (*Metrics, error) // Called every time new metrics are requested.
+	RawMetrics(Filter) ([]byte, error)
 }
 
 // InputPlugin describes an input plugin's consumable interface.
@@ -25,6 +26,12 @@ type InputPlugin struct {
 	Input
 }
 
+// Filter is used for raw metrics filters.
+type Filter struct {
+	Type string
+	Term string
+}
+
 // NewInput creates a metric input. This should be called by input plugins
 // init() functions.
 func NewInput(i *InputPlugin) {