Document cluster tweaks

[RobReus]

Details

Describe the solution you'd like:

We should document some cluster tweaks you can do on your raspernetes cluster.

Anything else you would like to add:

For example, when running etcd from an SD card, etcd will often elect a new leader due to the heartbeats being slower than usual due to the slower IO from an SD card. This could be worked around by setting --election-timeout to 5000 (default 1000).

Additional Information:

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