4bf1daef0a
* ui: Logout button This commit adds an easier way to logout of the UI using a logout button Notes: - Added a Logout button to the main navigation when you are logged in, meaning you have easy access to a way to log out of the UI. - Changed all wording to use 'Log in/out' vocabulary instad of 'stop using'. - The logout button opens a panel to show you your current ACL token and a logout button in order to logout. - When using legacy ACLs we don't show the current ACL token as legacy ACLs tokens only have secret values, whereas the new ACLs use a non-secret ID plus a secret ID (that we don't show). - We also added a new `<EmptyState />` component to use for all our empty states. We currently only use this for the ACLs disabled screen to provide more outgoing links to more readind material/documentation to help you to understand and enable ACLs. - The `<DataSink />` component is the sibling to our `<DataSource />` component and whilst is much simpler (as it doesn't require polling support), its tries to use the same code patterns for consistencies sake. - We had a fun problem with ember-data's `store.unloadAll` here, and in the end went with `store.init` to empty the ember-data store instead due to timing issues. - We've tried to use already existing patterns in the Consul UI here such as our preexisting `feedback` service, although these are likely to change in the future. The thinking here is to add this feature with as little change as possible. Overall this is a precursor to a much larger piece of work centered on auth in the UI. We figured this was a feature complete piece of work as it is and thought it was worthwhile to PR as a feature on its own, which also means the larger piece of work will be a smaller scoped PR also.
Consul 
- Website: https://www.consul.io
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Consul is a tool for service discovery and configuration. Consul is distributed, highly available, and extremely scalable.
Consul provides several key features:
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Service Discovery - Consul makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. External services such as SaaS providers can be registered as well.
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Health Checking - Health Checking enables Consul to quickly alert operators about any issues in a cluster. The integration with service discovery prevents routing traffic to unhealthy hosts and enables service level circuit breakers.
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Service Segmentation/Service Mesh - Consul Connect enables secure service-to-service communication with automatic TLS encryption and identity-based authorization. Applications can use sidecar proxies in a service mesh configuration to establish TLS connections for inbound and outbound connections without being aware of Connect at all.
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Key/Value Storage - A flexible key/value store enables storing dynamic configuration, feature flagging, coordination, leader election and more. The simple HTTP API makes it easy to use anywhere.
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