Reduce ATL metro probability to .5 (for one week) (#134)

Reduce ATL metro probability to .5

Author: stephen-soltesz

static/configs.go

@@ -82,6 +82,14 @@ var LegacyServices = map[string]string{
 // TODO(github.com/m-lab/locate/issues/92): Make this dynamic.
 var SiteProbability = map[string]float64{
 	"ams10": 0.3, // virtual site
+
+	// TODO(soltesz): revert ATL/CHS trial after 2023-05-15.
+	"atl02": 0.5,
+	"atl03": 0.5,
+	"atl04": 0.5,
+	"atl07": 0.5,
+	"atl08": 0.5,
+
 	"bom01": 0.1,
 	"bom02": 0.1,
 	"bru06": 0.3, // virtual site