Fault injection cli: zbchaos

[ChrisKujawa]

Write a new fault injection cli:

$ zbchaos
A chaos experimenting toolkit for Zeebe.
    Perfect to inject some chaos into your brokers and gateways.

Usage:
  zbchaos [command]

Available Commands:
  brokers     Print the name of the Zeebe broker pods
  completion  Generate the autocompletion script for the specified shell
  connect     Connect Zeebe nodes
  disconnect  Disconnect Zeebe nodes
  help        Help about any command
  restart     Restarts a Zeebe broker
  terminate   Terminates a Zeebe broker
  topology    Print the Zeebe topology deployed in the current namespace
  verify      Verify certain properties
  version     Print the version of zbchaos

Flags:
  -h, --help      help for zbchaos
  -v, --verbose   verbose output

Use "zbchaos [command] --help" for more information about a command.

It allows to:

• terminate brokers non-gracefully
• terminate standalone gateways non-gracefully
• restart brokers gracefully
• restart standalone gateway gracefully
• print the broker topology in a compact form
• verify certain attributes:
  • readiness; all broker pods and gateway deployment must be ready
  • steady-state; we can deploy a process model and create a PI on a certain partition
• disconnect nodes:
  • disconnect brokers with given partition roles (for specific partitions)
  • disconnect brokers with given node id
  • disconnect only in one direction
• connect all nodes again
• on all commands a verbose output can be turned on for debugging purposes

For certain more complicated logic tests have been written, but if can be of course improved. Workers were not yet implemented due to limited time.