Registered workers and their status should be stored in state

[alexandrebrg]

This issue should be discussed to determine new endpoints, new communication flows, and how the data is stored. If you want to be assigned to this issue, please ping us¹.

What needs to be done ?

• Workers status updates should be updated in metadata db
• Workers list should be able to be fetched through controller API
• Workers registration should be stored in metadata db (controller state)

What data is expected to be saved about a worker:
* Remote client IP and Riklet port
* The worker name
* Registration date
* Last-update (last time we received heartbeat)

Why it needs to be done ?

• Open for extensibility to know pods location
• Open for extensibility to know remote location of workers
• We will be able to apply pods recovery when a worker is unhealthy (move pods from one worker to another)

Footnotes

1. We can discuss individual points if you want to start small ↩