zcashd/doc/release-notes.md

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(note: this is a temporary file, to be added-to by anybody, and moved to
release-notes at release time)
Notable changes
===============
RPC Changes
-----------
- `getdeprecationinfo` has several changes:
- It now returns additional information about currently deprecated and
disabled features.
- A new `end_of_service` object that contains both the block height for
end-of-service and the estimated time that the end-of-service halt is
expected to occur. Note that this height is just an approximation and
should not be relied upon due to the variability in block times. The
`end_of_service` object is intended to replace the `deprecationheight`
field; see the [Deprecations](#deprecations) section for additional detail.
- This RPC method was previously only available for mainnet nodes; it is now
also available for testnet and regtest nodes, in which case it does not
return end-of-service halt information (as testnet and regtest nodes do not
have an end-of-service halt feature.)
[Deprecations](https://zcash.github.io/zcash/user/deprecation.html)
--------------
The following features have been deprecated, but remain available by default.
These features may be disabled by setting `-allowdeprecated=none`. 18 weeks
after this release, these features will be disabled by default and the following
flags to `-allowdeprecated` will be required to permit their continued use:
- `deprecationinfo_deprecationheight`: The `deprecationheight` field of
`getdeprecationinfo` has been deprecated and replaced by the `end_of_service`
object.