From 9ad155970f26c6558734e691f53819a425825731 Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Mon, 8 Aug 2022 15:13:19 -0400
Subject: [PATCH] chore: fee payer event (backport #12850) (#12856)

---
 types/events.go    | 1 +
 x/auth/ante/fee.go | 7 ++++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/types/events.go b/types/events.go
index 2bc9f55b996a..667475d8deac 100644
--- a/types/events.go
+++ b/types/events.go
@@ -288,6 +288,7 @@ var (
 	AttributeKeyAccountSequence = "acc_seq"
 	AttributeKeySignature       = "signature"
 	AttributeKeyFee             = "fee"
+	AttributeKeyFeePayer        = "fee_payer"
 
 	EventTypeMessage = "message"
 
diff --git a/x/auth/ante/fee.go b/x/auth/ante/fee.go
index 4c8de37218cc..e0d978d10db6 100644
--- a/x/auth/ante/fee.go
+++ b/x/auth/ante/fee.go
@@ -134,9 +134,10 @@ func (dfd *DeductFeeDecorator) checkDeductFee(ctx context.Context, feeTx sdk.Fee
 		}
 	}
 
-	events := sdk.Events{sdk.NewEvent(sdk.EventTypeTx,
-		sdk.NewAttribute(sdk.AttributeKeyFee, feeTx.GetFee().String()),
-	)}
+	events := sdk.Events{
+		sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFee, feeTx.GetFee().String())),
+		sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFeePayer, deductFeesFrom.String())),
+	}
 	ctx.EventManager().EmitEvents(events)
 
 	return next(ctx, tx, simulate)