Added a "new_shares" attribute inside the delegate event type (#9214)

* Added a "new_shares" attribute inside the delegate event type

* ADded CHANGELOG entry

CHANGELOG.md

@@ -44,6 +44,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#8754](https://github.com/cosmos/cosmos-sdk/pull/8875) Added support for reverse iteration to pagination.
 * [#9088](https://github.com/cosmos/cosmos-sdk/pull/9088) Added implementation to ADR-28 Derived Addresses.
 * [\#9133](https://github.com/cosmos/cosmos-sdk/pull/9133) Added hooks for governance actions.
+* (x/staking) [\#9214](https://github.com/cosmos/cosmos-sdk/pull/9214) Added `new_shares` attribute inside `EventTypeDelegate` event.
 
 ### Client Breaking Changes
 * [\#8363](https://github.com/cosmos/cosmos-sdk/pull/8363) Addresses no longer have a fixed 20-byte length. From the SDK modules' point of view, any 1-255 bytes-long byte array is a valid address.

x/staking/keeper/msg_server.go

@@ -204,7 +204,7 @@ func (k msgServer) Delegate(goCtx context.Context, msg *types.MsgDelegate) (*typ
 	}
 
 	// NOTE: source funds are always unbonded
-	_, err = k.Keeper.Delegate(ctx, delegatorAddress, msg.Amount.Amount, types.Unbonded, validator, true)
+	newShares, err := k.Keeper.Delegate(ctx, delegatorAddress, msg.Amount.Amount, types.Unbonded, validator, true)
 	if err != nil {
 		return nil, err
 	}
@@ -225,6 +225,7 @@ func (k msgServer) Delegate(goCtx context.Context, msg *types.MsgDelegate) (*typ
 			types.EventTypeDelegate,
 			sdk.NewAttribute(types.AttributeKeyValidator, msg.ValidatorAddress),
 			sdk.NewAttribute(sdk.AttributeKeyAmount, msg.Amount.Amount.String()),
+			sdk.NewAttribute(types.AttributeKeyNewShares, newShares.String()),
 		),
 		sdk.NewEvent(
 			sdk.EventTypeMessage,

x/staking/types/events.go

@@ -17,5 +17,6 @@ const (
 	AttributeKeyDstValidator      = "destination_validator"
 	AttributeKeyDelegator         = "delegator"
 	AttributeKeyCompletionTime    = "completion_time"
+	AttributeKeyNewShares         = "new_shares"
 	AttributeValueCategory        = ModuleName
 )