VTAdmin: Workflow Details tab

[rohit-nayak-ps]

Feature Description

Currently the VTAdmin page for a specific Workflow shows detailed info in a JSON tab. While this shows all the output of a Workflow Show it is difficult for users to quickly find useful information for debugging or monitoring.

Let's add a new tab Details which extracts the Workflow Show output into structured UI elements which should include:

• Current Status: which phase is this workflow in (copy/running/switched)? Is it stopped? Is it being throttled?
• If switched link to the reverse workflow with some basic information about the reverse workflow like name, keyspace, status and current vreplication lag.
• If the Workflow is in Error, then print the message
• If in copy phase, how many tables left, rows copied, what is the ETA?
• If running, what is the vreplication lag?
• Recent log entries

If there are multiple streams then show summary information on top wrt Statuses and then each stream info below.