SwitchTraffic switches traffic forward for the tablet_types specified. This replaces the previous
SwitchReads and SwitchWrites commands with a single one. It is also possible now to switch all traffic with just one
command. Also, you can now switch replica, rdonly and primary traffic in any order: earlier you needed to first
SwitchReads (for replicas and rdonly tablets) first before SwitchWrites.
For master tablets, SwitchTraffic first stops writes on the source master and waits for the replication to the target to
catchup with the point where the writes were stopped. If the wait time is longer than timeout
the command will error out. For setups with high write qps you may need to increase this value.
SwitchTraffic for master tablet types, by default, starts a reverse replication stream with the current target as the source, replicating back to the original source. This enables a quick and simple rollback using ReverseTraffic. This reverse workflow name is that of the original workflow concatenated with _reverse.
If set to false these reverse replication streams will not be created and you will not be able to rollback once you have switched write traffic over to the target.