Market Health

[Ivshti]

each campaign/channel should have a "market health"

which is an aggregate of the

• health as reported by each validator
• off-chain state, as determined per: https://github.com/AdExNetwork/adex-validator-stack-js/issues/17

so a healthy channel would satisfy:

• recent heartbeat for all validators
• there is a recent NewState
• last ApproveState is recent and reports healthy
• recent NewState and ApproveState have the same stateRoot value

if the state is unhealthy, there should be good information on why it happens, for example "Channel is unhealthy cause validator A is offline" or "Channel is unhealthy cause validator A reports unhealthy"

[Ivshti]

we should be able to easily compute this value in the browser directly (by querying the validators) so that we don't rely on a cenral service such as the market

It helps that the market will be initially implemented in JS, but this getMarketHealth operation should be written as a library