## edge-23.4.1
This is a release candidate for stable-2.13.0 — we encourage you to help
try it out!
This edge release introduces request-level HTTP circuit-breaking
using a consecutive failures failure accrual policy. Circuit breaking can be
configured by adding failure accrual annotations to a Service. In addition, this
release adds new `outbound_route_backend_http_requests_total` and
`outbound_route_backend_grpc_requests_total` proxy metrics, which can be
used to track how routing rules and backend distributions apply to
requests. These metrics contain labels describing the route's parent
(i.e. a Service), the route resource being used, and the backend
resource being used by each request.
* Proxy
* Added discovery of failure accrual policies from the OutboundPolicy API
* Implemented consecutive failures failure accrual policy
* Added INFO-level logging on failure accrual changes
* Added `outbound_route_backend_http_requests_total` and
`outbound_route_backend_grpc_requests_total` metrics
* Policy Controller
* Added failure accrual configuration to the OutboundPolicy API
* Added Prometheus `/metrics` endpoint to the admin server, with process
metrics
* Changed the policy controller to only accept HTTPRoutes when the parentRef
is a ClusterIP Service
* Added ports to service references in the OutboundPolicy API
* Viz
* Added `tap.ignoredHeaders` Helm value to the linkerd-viz chart. This value
allows users to specify a comma-separated list of header names which will be
ignored by Linkerd Tap (thanks @ryanhristovski!)
* Removed duplicate SecurityContext in Prometheus manifest
* Multicluster
* Removed duplicate AuthorizationPolicy for probes from the multicluster
gateway Helm chart