grpc_v2.go
func (g GRPCLoggerV2) Fatalf(format string, args ...interface{}) {
	g.l.Criticalf(format, args...)
}
func (g GRPCLoggerV2) Fatalf(format string, args ...interface{}) {
	g.l.Criticalf(format, args...)
}
// Fatalf calls Logger.Criticalf method with provided arguments.