Add benchmark.

metricingester/aggworker_test.go

@@ -0,0 +1,15 @@
+package metricingester
+
+import "testing"
+
+func BenchmarkWorkerIngest(b *testing.B) {
+	w := newAggWorker()
+	w.Start()
+	// we don't want slice allocation to be part of the benchmark since this is normally done
+	// outside of creating a metric.
+	tags := []string{"c:d", "f:g", "a:b"}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		w.Ingest(NewCounter("mycounter", 100, tags, 1.0, "myhost"))
+	}
+}