chore: changelog update (backport cosmos#12859) (cosmos#12862)

CHANGELOG.md

@@ -46,6 +46,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* (events) [#12850](https://github.com/cosmos/cosmos-sdk/pull/12850) Add a new `fee_payer` attribute to the `tx` event that is emitted from the `DeductFeeDecorator` AnteHandler decorator.
 * (x/params) [#12724](https://github.com/cosmos/cosmos-sdk/pull/12724) Add `GetParamSetIfExists` function to params `Subspace` to prevent panics on breaking changes.
 * [#12668](https://github.com/cosmos/cosmos-sdk/pull/12668) Add `authz_msg_index` event attribute to message events emitted when executing via `MsgExec` through `x/authz`.
 * [#12697](https://github.com/cosmos/cosmos-sdk/pull/12697) Upgrade IAVL to v0.19.0 with fast index and error propagation. NOTE: first start will take a while to propagate into new model.

x/auth/ante/fee.go

@@ -135,8 +135,11 @@ func (dfd *DeductFeeDecorator) checkDeductFee(ctx context.Context, feeTx sdk.Fee
 	}
 
 	events := sdk.Events{
-		sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFee, feeTx.GetFee().String())),
-		sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFeePayer, deductFeesFrom.String())),
+		sdk.NewEvent(
+			sdk.EventTypeTx,
+			sdk.NewAttribute(sdk.AttributeKeyFee, fee.String()),
+			sdk.NewAttribute(sdk.AttributeKeyFeePayer, deductFeesFrom.String()),
+		),
 	}
 	ctx.EventManager().EmitEvents(events)