Workflow Show is used to monitor running workflows either using the vtctld CLI/GRPC or the vtadmin UI. These are often continuously refreshed to get recent information. The amount of data sent can be very large. For example, a MoveTables to 128 shards with a very small number of tables is >300KB. For larger resharding workflows we have seen responses greater than the set GRPC max message size and needed to increase it!

Other than the core metadata (keyspaces, workflow type), most of the time users just want to see

• the status of the streams (consolidated)
• overall workflow status (reads/writes switched or not)
• current max lag
• error message(s) if any
• if throttled

It will be useful to add a verbosity level to calibrate the amount of information that is sent.