Linkerd

edge-26.4.1Networking & Messaging

Apr 3, 2026Copy link

Mostly a dependency maintenance release with two proxy bumps (v2.346.0, v2.347.0), a multicluster RBAC fix, and a Prometheus config correction for viz admin port names.

• breakingCheck Prometheus metrics after upgrading if you use Linkerd Viz

  The Prometheus config was corrected to match new admin port names. If you're running Linkerd Viz and upgraded from an earlier edge build, verify your dashboards still show expected metrics after the upgrade. Gaps in scraping could have silently existed before this fix — cross-check your Prometheus targets to confirm scrape health.

• enhancementMulticluster users: review Server/AuthorizationPolicy coverage

  Missing Server and AuthorizationPolicy resources were added for the multicluster extension. If you use Linkerd multicluster, upgrade and audit your cross-cluster authorization posture. The previous gap meant some traffic paths lacked proper policy objects, which could have caused unexpected allow/deny behavior depending on your default policy.

• securityCrypto dependency updates — low urgency but keep your upgrade cadence

  openssl, rustls-webpki, aws-lc-rs, and aws-lc-sys all received patch bumps this cycle. None carry disclosed CVEs, but these are core cryptographic libraries in the proxy. Stay on a regular edge upgrade cadence rather than skipping multiple releases, so these patches don't accumulate.