proxy: v2.155.0

[olix0r]

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

[Pothulapati]

LGTM