Release v9

[crodriguezvega]

This release main additions are:

ICS20 v2

• Support for multi-denom transfers.
• Support for path forwarding.
• Support for protobuf encoding of packet data.

02-client router refactoring

• Decouple 02-client routing from encoding.

Milestones

v9.0.0
ICS20 v2 (multi denom) alpha
ICS20 v2 (multi denom) beta
ICS20 v2 (multi denom) RC
ICS20 v2 (path forwarding) alpha
ICS20 v2 (path forwarding) beta
ICS20 v2 (path forwarding) RC

IBC spec compatibility

v1.0.0

QA

Backwards compatibility

• Compatibility tests pass for the release branch.
• Upgrade tests pass.
• Manual test with ledger signing of IBC transfer.

Other testing

Migration

Checklist

• Bump go package version.
• Change all imports starting with github.com/cosmos/ibc-go/v8 to github.com/cosmos/ibc-go/v9.
• Branch off main to create release branch in the form of release/v9.0.x and add branch protection rules.
• Add branch protection rules to new release branch.
• Add backport task to mergify.yml
• Upgrade ibc-go version in ibctest.
• Check Swagger is up-to-date.

Post-release checklist

• Update CHANGELOG.md
• Update the table of supported release lines (and End of Life dates) in RELEASES.md:
  • Add the new release line.
  • Remove any release lines that might have become discontinued.
• Update version matrix in RELEASES.md:
  • Add the new release.
  • Remove any tags that might not be recommended anymore.
• Update the list of supported release lines in README.md, if necessary.
• Update docs site:
  • Update permalinks with links of the released tag.
  • If the release is occurring on the main branch, on the latest version, then run npm run docusaurus docs:version v9.0.x in the docs/ directory.
• Update the compatibility test matrices:
  • Add the new release.
  • Remove any tags that might not be recommended anymore.
• Update the manual e2e simd test workflow:
  • Remove any tags that might not be recommended anymore.
• After changes to docs site are deployed, check ibc.cosmos.network is updated.
• Open issue in SDK tutorials repo to update tutorials to the released version of ibc-go.

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged/assigned