Feature Request: Include the slashed amount in slash event

[calvinlauyh]

Summary

Right now the slash event returns only the address, current power and reason for slashing. However, it does not cover how much is slashed.

Problem Definition

I am working on an chain data indexer, and I am unable to get the slashed amount unless I port the logic and calcuate. However, doing my own calculation may introduce inaccuracy and inconsistent with the Cosmos SDK.

Proposal

I would like to request adding a new key-value pair to the slash event:

burned

• which is the token burn from the slashing

In the current implementation, the Slash method of StakingKeeper is called after slash event is emitted

cosmos-sdk/x/slashing/keeper/keeper.go

Line 70 in b219c54

types.EventTypeSlash,

If we can update the slash keeper's Slash method to return the slashed token, then it can be included in the event.

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[alexanderbez]

ACK 👍

[technicallyty]

this has been implemented in #9458 and will be merged after v043 is released