fix(x/slashing): Emit slashing event with the correct reason in SlashWithInfractionReason (#16784)

CHANGELOG.md

@@ -71,6 +71,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (x/slashing) [#16784](https://github.com/cosmos/cosmos-sdk/pull/16784) Emit event with the correct reason in SlashWithInfractionReason.
 * (x/auth/vesting) [#16733](https://github.com/cosmos/cosmos-sdk/pull/16733) panic on overflowing and negative EndTimes when creating a PeriodicVestingAccount
 * [#16547](https://github.com/cosmos/cosmos-sdk/pull/16547) Ensure a transaction's gas limit cannot exceed the block gas limit.
 * (x/auth/types) [#16554](https://github.com/cosmos/cosmos-sdk/pull/16554) `ModuleAccount.Validate` now reports a nil `.BaseAccount` instead of panicking.

x/slashing/keeper/keeper.go

@@ -88,13 +88,21 @@ func (k Keeper) SlashWithInfractionReason(ctx context.Context, consAddr sdk.Cons
 		return err
 	}
 
+	reasonAttr := sdk.NewAttribute(types.AttributeKeyReason, types.AttributeValueUnspecified)
+	switch infraction {
+	case stakingtypes.Infraction_INFRACTION_DOUBLE_SIGN:
+		reasonAttr = sdk.NewAttribute(types.AttributeKeyReason, types.AttributeValueDoubleSign)
+	case stakingtypes.Infraction_INFRACTION_DOWNTIME:
+		reasonAttr = sdk.NewAttribute(types.AttributeKeyReason, types.AttributeValueMissingSignature)
+	}
+
 	sdkCtx := sdk.UnwrapSDKContext(ctx)
 	sdkCtx.EventManager().EmitEvent(
 		sdk.NewEvent(
 			types.EventTypeSlash,
 			sdk.NewAttribute(types.AttributeKeyAddress, consAddr.String()),
 			sdk.NewAttribute(types.AttributeKeyPower, fmt.Sprintf("%d", power)),
-			sdk.NewAttribute(types.AttributeKeyReason, types.AttributeValueDoubleSign),
+			reasonAttr,
 			sdk.NewAttribute(types.AttributeKeyBurnedCoins, coinsBurned.String()),
 		),
 	)

x/slashing/types/events.go

@@ -13,6 +13,7 @@ const (
 	AttributeKeyMissedBlocks = "missed_blocks"
 	AttributeKeyBurnedCoins  = "burned_coins"
 
+	AttributeValueUnspecified      = "unspecified"
 	AttributeValueDoubleSign       = "double_sign"
 	AttributeValueMissingSignature = "missing_signature"
 )