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title: Validator disabling strategy in runtime
doc:
- audience: Node Operator
description: |
On each committed offence (no matter slashable or not) the offending validator will be
disabled for a whole era.
- audience: Runtime Dev
description: |
The disabling strategy in staking pallet is no longer hardcoded but abstracted away via
`DisablingStrategy` trait. The trait contains a single function (make_disabling_decision) which
is called for each offence. The function makes a decision if (and which) validators should be
disabled. A default implementation is provided - `UpToLimitDisablingStrategy`. It
will be used on Kusama and Polkadot. In nutshell `UpToLimitDisablingStrategy`
disables offenders up to the configured threshold. Offending validators are not disabled for
offences in previous eras. The threshold is controlled via `DISABLING_LIMIT_FACTOR` (a generic
parameter of `UpToLimitDisablingStrategy`).
migrations:
db: []
runtime:
- reference: pallet-staking
description: |
Renames `OffendingValidators` storage item to `DisabledValidators` and changes its type from
`Vec<(u32, bool)>` to `Vec<u32>`.
crates:
- name: pallet-staking