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docs: updating v3->v4 migration docs with fee middleware #2127

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Sep 26, 2022
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docs: updating v3->v4 migration docs with fee middleware #2127

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9a045f9
updating v3->v4 migration docs with fee middleware
seantking Aug 25, 2022
14e674e
fix: docs
seantking Aug 25, 2022
28ef34f
Merge branch 'main' into sean/issue#2089-fee-middleware-migration-docs
colin-axner Sep 21, 2022
a4189df
self requests
colin-axner Sep 21, 2022
2979e11
Merge branch 'main' into sean/issue#2089-fee-middleware-migration-docs
damiannolan Sep 26, 2022
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8 changes: 8 additions & 0 deletions docs/migrations/v3-to-v4.md
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Expand Up @@ -18,6 +18,14 @@ No genesis or in-place migrations required when upgrading from v1 or v2 of ibc-g

## Chains

### Fee Middleware

The Fee Middleware module, as the name suggests, plays the role of an IBC middleware and as such must be configured by chain developers to route and handle IBC messages correctly.

Please read the Fee Middleware [integration documentation](https://ibc.cosmos.network/main/middleware/ics29-fee/integration.html) for an in depth guide on how to congfigure the module correctly in order to incentivize IBC packets.
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Take a look at the following diff for an [example setup](https://github.com/cosmos/ibc-go/pull/1432/files#diff-d18972debee5e64f16e40807b2ae112ddbe609504a93ea5e1c80a5d489c3a08aL366) of how to incentivize ics27 channels.

### Migration to fix support for base denoms with slashes

As part of [v1.5.0](https://github.com/cosmos/ibc-go/releases/tag/v1.5.0), [v2.3.0](https://github.com/cosmos/ibc-go/releases/tag/v2.3.0) and [v3.1.0](https://github.com/cosmos/ibc-go/releases/tag/v3.1.0) some [migration handler code sample was documented](https://github.com/cosmos/ibc-go/blob/main/docs/migrations/support-denoms-with-slashes.md#upgrade-proposal) that needs to run in order to correct the trace information of coins transferred using ICS20 whose base denom contains slashes.
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