Add Readiness Checks to Native Service Discovery

[mikenomitch]

Proposal

Currently Nomad Service Discovery is using task health to determine whether or not a service is healthy and should be returned by the API and in the Template helper.

It would be nice to be able to define a more granular health check. Likely this would use the check stanza like Consul health checks defined in Nomad.

Use-cases

Separating Nomad task health from readiness to receive traffic.

[mikenomitch]

Delivered in 1.4!

[github-actions]

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