The most famous opensource pool uses eth_getBlockByNumber method with parameter "pending" to get block template and generate jobs from it. But now, in parity, I found that this parameter is deprecated and I would like to understand why. Also, if this is really bad way to get a block template from the node, I would like to know how to do it right? Perhaps I need to use another method?

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This is an rpc call that is implemented across clients and I doubt Parity has any plans to deprecate this, as it would break too many application.

There is however a strong desire to stop support for account management and hence most of the rpcs to do with account management have a deprecation notice.

You can view them here: https://github.com/paritytech/parity-ethereum/search?q=self.deprecation_notice.print&unscoped_q=self.deprecation_notice.print

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