Sourced from google.golang.org/grpc's releases.

Release 1.80.0

Behavior Changes

• balancer: log a warning if a balancer is registered with uppercase letters, as balancer names should be lowercase. In a future release, balancer names will be treated as case-insensitive; see #5288 for details. (#8837)
• xds: update resource error handling and re-resolution logic (#8907)
  • Re-resolve all LOGICAL_DNS clusters simultaneously when re-resolution is requested.
  • Fail all in-flight RPCs immediately upon receipt of listener or route resource errors, instead of allowing them to complete.

Bug Fixes

• xds: support the LB policy configured in LOGICAL_DNS cluster resources instead of defaulting to pick_first. (#8733)
• credentials/tls: perform per-RPC authority validation against the leaf certificate instead of the entire peer certificate chain. (#8831)
• xds: enabling A76 ring hash endpoint keys no longer causes EDS resources with invalid proxy metadata to be NACKed when HTTP CONNECT (gRFC A86) is disabled. (#8875)
• xds: validate that the sum of endpoint weights in a locality does not exceed the maximum uint32 value. (#8899)
  • Special Thanks: @​RAVEYUS
• xds: fix incorrect proto field access in the weighted round robin (WRR) configuration where blackout_period was used instead of weight_expiration_period. (#8915)
  • Special Thanks: @​gregbarasch
• xds/rbac: handle addresses with ports in IP matchers. (#8990)

New Features

• ringhash: enable gRFC A76 (endpoint hash keys and request hash headers) by default. (#8922)

Performance Improvements

• credentials/alts: pool write buffers to reduce memory allocations and usage. (#8919)
• grpc: enable the use of pooled write buffers for buffering HTTP/2 frame writes by default. This reduces memory usage when connections are idle. Use the WithSharedWriteBuffer dial option or the SharedWriteBuffer server option to disable this feature. (#8957)
• xds/priority: stop caching child LB policies removed from the configuration. This will help reduce memory and cpu usage when localities are constantly switching between priorities. (#8997)
• mem: add a faster tiered buffer pool; use the experimental mem.NewBinaryTieredBufferPool function to create such pools. (#8775)

• 397e45e Change version to 1.80.0 (#8948)
• 64ebf0a Cherry-pick #8997 to v1.80.x (#9027)
• e45ed24 xds/rbac: add additional handling for addresses with ports (#8990) (#9022)
• c78d26e Cherry-pick #8957 to v1.80.x (#9007)
• bd7cd3c grpc: enforce strict path checking for incoming requests on the server (#8987)
• b6597b3 xds/clusterimpl: use xdsConfig for updates and remove redundant fields from L...
• 1d4fa8a xds: change cdsbalancer to use update from dependency manager (#8907)
• 8f47d36 attributes: Replace internal map with linked list (#8933)
• 22e1ee8 xds: add panic recovery in xdsclient resource unmarshalling. (#8895)
• 7136e99 credentials/alts: Pool write buffers (#8919)
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