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docs: Add Consul 1.10 release notes (#10489) 

Co-authored-by: Mike Morris <mikemorris@users.noreply.github.com>
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---
layout: docs
page_title: 1.10.0
---
# Consul 1.10.0
## Release Highlights
- **Transparent Proxy:** Simplifies deploying applications into the service mesh by using iptables to redirect traffic from applications running in virtual machines or Kubernetes through the Envoy proxy.
- **Support for xDS v3 and Incremental xDS:** Consul 1.10 will default to using xDS version 3 and Incremental xDS for all supported Envoy proxy versions bootstrapped by the Consul 1.10 CLI. This is driven by the fact that xDS v2 was deprecated in Envoy 1.15 and disabled in Envoy 1.17. Envoy proxies bootstrapped with older Consul CLI binaries will continue to use the xDS v2 state-of-the-world API.
- **Streaming Enabled by Default for Service Health:** Streaming is a major architectural enhancement in how update notifications for blocking queries are delivered within the cluster which significantly reduces CPU and network bandwidth usage for large-scale Consul deployments. In Consul 1.10, streaming is now available for the service health HTTP endpoint and is enabled by default.
- **Redesigned UI and Observability Enhancements:** The Consul UI has been redesigned with a new sidebar layout. Additionally, Kubernetes users now have the ability to deploy Prometheus via the Consul Helm chart which automatically integrates it with Consul’s Service Visualization UI for displaying traffic metrics between services. Lastly, Pod and Envoy metrics can now be exposed to Prometheus using Kubernetes annotations via a single aggregated endpoint.
- **Deprecation of Legacy ACL System:** In Consul 1.4, we upgraded to a new Access Controls (ACLs) system. This upgrade made improvements in Consul’s ACL system handles the API, Tokens, and Policies. With Consul 1.10, the legacy system is officially deprecated, and will be removed from Consul in a later release. We strongly recommend that users begin the process of migrating to the newer ACL system.
## What's Changed
- Drops support for Envoy version 1.13.x.
- (Enterprise Only) Consul Enterprise has removed support for temporary licensing. All server agents must have a valid license at startup and client agents must have a license at startup or be able to retrieve one from the servers.
For more detailed information, please refer to the [upgrade details page](https://www.consul.io/docs/upgrading/upgrade-specific#consul-1-10-0) and the [1.10.0 changelog](https://github.com/hashicorp/consul/releases/tag/v1.10.0).

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## Release Highlights
- *Application-Aware Intentions:* A new set of capabilities that extends Consul’s intentions model to support Layer 7 request information. Intentions now provide the ability for operators to construct policies which evaluate application-layer information such as HTTP Path, Headers, or Method – in addition to service identity – when authorizing HTTP-based (HTTP/1.1, HTTP/2, gRPC) service-to-service communication.
- **Application-Aware Intentions:** A new set of capabilities that extends Consul’s intentions model to support Layer 7 request information. Intentions now provide the ability for operators to construct policies which evaluate application-layer information such as HTTP Path, Headers, or Method – in addition to service identity – when authorizing HTTP-based (HTTP/1.1, HTTP/2, gRPC) service-to-service communication.
- *Service Mesh Visualization:* This addition provides a new topology tab to the Consul UI which displays topology diagrams and key service mesh metrics like request, error rates, and timing metrics. These new features will assist developers and operators in verifying configuration and troubleshooting issues within the service mesh. The UI also supports deep linking into your external metrics dashboards.
- **Service Mesh Visualization:** This addition provides a new topology tab to the Consul UI which displays topology diagrams and key service mesh metrics like request, error rates, and timing metrics. These new features will assist developers and operators in verifying configuration and troubleshooting issues within the service mesh. The UI also supports deep linking into your external metrics dashboards.
- *Improved Metrics and Grafana Dashboard:* Consul 1.9 additionally updates several metrics to reduce cardinality in metric names in favor of the best practice of using labels instead and provides a Grafana dashboard template that exposes the most important metrics associated with the Consul datacenter for operators.
- **Improved Metrics and Grafana Dashboard:** Consul 1.9 additionally updates several metrics to reduce cardinality in metric names in favor of the best practice of using labels instead and provides a Grafana dashboard template that exposes the most important metrics associated with the Consul datacenter for operators.
- *Custom Resources for Kubernetes:* Consul now provides a Kubernetes-first experience through CRDs to allow practitioners to easily configure Consul service mesh via Kubernetes-style objects.
- **Custom Resources for Kubernetes:** Consul now provides a Kubernetes-first experience through CRDs to allow practitioners to easily configure Consul service mesh via Kubernetes-style objects.
- *Deploy Consul in OpenShift:* Enable installing Consul via Helm chart in OpenShift. We’ve now ensured that Consul Kubernetes runs on OpenShift securely by ensuring that Consul runs as non-root and also provided a set of SecurityContextConstraints to deploy Consul securely.
- **Deploy Consul in OpenShift:** Enable installing Consul via Helm chart in OpenShift. We’ve now ensured that Consul Kubernetes runs on OpenShift securely by ensuring that Consul runs as non-root and also provided a set of SecurityContextConstraints to deploy Consul securely.
- Installing Consul on OpenShift should now be as simple as running a Helm install with the `global.openshift.enabled` set to `true`.
- *Active Health Checks for Consul on Kubernetes:* Consul service mesh now integrates with Kubernetes Readiness probes. This provides the ability to natively detect health status from Kubernetes via Readiness probe, and is then used for directing service mesh traffic.
- **Active Health Checks for Consul on Kubernetes:** Consul service mesh now integrates with Kubernetes Readiness probes. This provides the ability to natively detect health status from Kubernetes via Readiness probe, and is then used for directing service mesh traffic.
- *Streaming:* This feature introduces a major architectural enhancement in how update notifications for blocking queries are delivered within the cluster. Streaming results in very significant reduction of CPU and network bandwidth usage on Consul servers in large-scale deployments. Streaming is particularly helpful in scaling blocking queries in Consul clusters that have rapid changes in service state.
- **Streaming:** This feature introduces a major architectural enhancement in how update notifications for blocking queries are delivered within the cluster. Streaming results in very significant reduction of CPU and network bandwidth usage on Consul servers in large-scale deployments. Streaming is particularly helpful in scaling blocking queries in Consul clusters that have rapid changes in service state.
- Streaming is now available for the service health HTTP endpoint, and can be enabled through the [`use_streaming_backend`](https://www.consul.io/docs/agent/options#use_streaming_backend) client configuration option, and [`rpc.enable_streaming`](https://www.consul.io/docs/agent/options#rpc_enable_streaming) option on the servers. We will continue to enable streaming in more endpoints in subsequent releases.
## What's Changed

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