proxy: v2.155.0

This release features some performance improvements: tokio has been
updated to pick up tokio-rs/tokio#4055, and link-time optimizations have
been enabled in release builds. These changes reduce CPU and memory
overhead in benchmarks.

Inbound policy enforcement has been updated so that TCP forwarding is
interrupted if a policy update revokes a previously-established
authorization. New metrics are exposed to reflect how policies are used
by the proxy: `inbound_http_authz_{allow,deny}_total` and
`inbound_tcp_authz_{allow,deny,terminate}_total`.

The proxy's error metrics, `{inbound,outbound}_{http,tcp}_errors_total`,
have been updated to include the traffic target. And the `traffic_addr`
metric label is augmented by `target_ip` and `target_port` labels to
support more flexible prometheus queries.

Inbound TCP metrics now only include a `srv_name` label, as it can't be
expected for all inbound connections to include authorization labels
(hence the new authz metrics). However, all inbound HTTP metrics--except
for the HTTP errors metric, which includes only a `srv_name`
label--include both `srv_name` and `saz_name` label.

Finally, the inbound and outbound proxies now only exports
Route-oriented metrics when a ServiceProfile is enabled, preventing
redundant metrics from being exported with no differentiating labels.

---

* profiles: Avoid creating a default route stack (linkerd/linkerd2-proxy#1223)
* build(deps): bump arbitrary from 1.0.1 to 1.0.2 (linkerd/linkerd2-proxy#1224)
* build(deps): bump trust-dns-resolver from `f08860c` to `3d0667a` (linkerd/linkerd2-proxy#1225)
* build(deps): bump libc from 0.2.100 to 0.2.101 (linkerd/linkerd2-proxy#1226)
* Enable link-time optimizations (linkerd/linkerd2-proxy#1227)
* build(deps): bump serde_json from 1.0.66 to 1.0.67 (linkerd/linkerd2-proxy#1228)
* build(deps): bump flate2 from 1.0.20 to 1.0.21 (linkerd/linkerd2-proxy#1230)
* build(deps): bump thiserror from 1.0.26 to 1.0.28 (linkerd/linkerd2-proxy#1231)
* build(deps): bump futures from 0.3.16 to 0.3.17 (linkerd/linkerd2-proxy#1232)
* build(deps): bump parking_lot from 0.11.1 to 0.11.2 (linkerd/linkerd2-proxy#1234)
* build(deps): bump trust-dns-resolver from `3d0667a` to `v0.21.0-alpha.2` (linkerd/linkerd2-proxy#1233)
* Rename push_on_response to push_on_service (linkerd/linkerd2-proxy#1235)
* build(deps): bump tokio from 1.10.1 to 1.11.0 (linkerd/linkerd2-proxy#1236)
* metrics: Add `target_ip` and `target_port` labels (linkerd/linkerd2-proxy#1238)
* inbound: Improve policy metrics (linkerd/linkerd2-proxy#1237)
* inbound: Include server labels in tap responses (linkerd/linkerd2-proxy#1239)
* Revert rustc update for release builds

.proxy-version

@@ -1 +1 @@
-v2.154.0
+v2.155.0