time() return milliseconds (#3811)

promql/functions.go

@@ -38,7 +38,7 @@ type Function struct {
 // === time() float64 ===
 func funcTime(ev *evaluator, args Expressions) Value {
 	return Scalar{
-		V: float64(ev.Timestamp / 1000),
+		V: float64(ev.Timestamp) / 1000,
 		T: ev.Timestamp,
 	}
 }

promql/testdata/functions.test

@@ -434,6 +434,9 @@ clear
 eval instant at 0m year()
   {} 1970
 
+eval instant at 1ms time()
+  0.001
+
 eval instant at 0m year(vector(1136239445))
   {} 2006