Add 'AddValuesWithTime' function to accumulator

plugins/registry.go

@@ -1,7 +1,22 @@
 package plugins
 
+import "time"
+
 type Accumulator interface {
+	// Create a named point with a value, decorating it with named tags
+	// NOTE: tags is expected to be owned by the caller, don't mutate
+	// it after passing to Add.
 	Add(name string, value interface{}, tags map[string]string)
+
+	// Create a named point with a set of values, decorating it with named tags
+	// NOTE: tags and values are expected to be owned by the caller, don't mutate
+	// them after passing to AddValuesWithTime.
+	AddValuesWithTime(
+		name string,
+		values map[string]interface{},
+		tags map[string]string,
+		timestamp time.Time,
+	)
 }
 
 type Plugin interface {