I would like to determine the number of blocks produced in a given era index.
In polkadot.app there is a query to get reward points in an era:
Staking Query: erasRewardsPoints(EraIndex).
How can I determine the number of blocks produced in one specific Era? Is there any query for that? If not, if I traverse the blocks, is the Era index included in the block data? I can not find it.
Thanks very much.