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Edge 19.5.4 Release Notes (#2872) 

## edge-19.5.4

* CLI
  * Added a JSON option to the `linkerd edges` command so that output is
    scripting friendly and can be parsed easily (thanks @alenkacz!)
* Controller
  * **New** Control plane installations now generate a self-signed certificate
    and private key pair for each webhook, to prepare for future work to make
    the proxy injector and service profile validator HA
  * Added a debug container annotation, allowing the `--enable-debug-sidecar`
    flag to work when auto-injecting Linkerd proxies
* Proxy
  * Changed the proxy's routing behavior so that, when the control plane does
    not resolve a destination, the proxy forwards the request with minimal
    additional routing logic
  * Fixed a bug in the proxy's HPACK codec that could cause requests with very
    large header values to hang indefinitely
* Web UI
  * Removed the Authorities table and sidebar link from the dashboard to prepare
    for a new, improved dashboard view communicating authority data
* Internal
  * Modified the integration test for `linkerd upgrade` to test upgrading from
    the latest stable release instead of the latest edge, to reflect the typical
    use case
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## edge-19.5.4
* CLI
* Added a JSON option to the `linkerd edges` command so that output is
scripting friendly and can be parsed easily (thanks @alenkacz!)
* Controller
* **New** Control plane installations now generate a self-signed certificate
and private key pair for each webhook, to prepare for future work to make
the proxy injector and service profile validator HA
* Added a debug container annotation, allowing the `--enable-debug-sidecar`
flag to work when auto-injecting Linkerd proxies
* Proxy
* Changed the proxy's routing behavior so that, when the control plane does
not resolve a destination, the proxy forwards the request with minimal
additional routing logic
* Fixed a bug in the proxy's HPACK codec that could cause requests with very
large header values to hang indefinitely
* Web UI
* Removed the Authorities table and sidebar link from the dashboard to prepare
for a new, improved dashboard view communicating authority data
* Internal
* Modified the integration test for `linkerd upgrade` to test upgrading from
the latest stable release instead of the latest edge, to reflect the typical
use case
## stable-2.3.1
This stable release adds a number of proxy stability improvements.