Check replication setting for JetStream

[welteki]

Check if nats.streamReplication is set to a minimum of 3, the recommended production value.

Expected Behaviour

Print a warning when nats.streamReplication is set to a value less then 3.

Current Behaviour

No checks are implemented.

Possible Solution

Check the value of the nats_stream_replicas env variable for the queue-worker

[mrwormhole]

@welteki seems like this is done https://github.com/openfaas/config-checker/blob/master/main.go#L545-L547
can be closed perhaps

[alexellis]

Hi @mrwormhole this would need to look at the stream replication by connecting to the JetStream API itself, rather than the number of replicas. Thanks for your interest.

Alternatively, as @welteki says, there's an env-var that can be inspected.

[mrwormhole]

ok so I will locate the queue_worker pod then get its env variable via kubernetes go client for nats_stream_replicas

is queue worker always single pod?

or I talk to nats pod via nats client and ask for replica count. I will do what @welteki says