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Proposal: no quick tree-head endpoint
Refer to
https://git.sigsum.org/sigsum/tree/archive/2022-01-18-tree-head-endpoint-observations
for background.
This proposal suggests that we only have two tree head endpoints.
1. get-tree-head-to-cosign -> signed tree head. This is the tree head that
witnesses are currently cosigning. This endpoint is only meant to be used
by witnesses.
2. get-tree-head-cosigned -> cosigned tree head. This is the finalized tree
head that witnesses have finished cosigning. The list of cosignatures is
thus fixed.
The to-cosign and cosigned tree heads are rotated every $n minutes. A typical
value of $n is likely going to be five (5). It might be lower if witnesses
accept to work more.
Pros:
* Less complex API. It has fewer endpoints and no choice between a "quick"
or "slow" get-tree-head-cosigned endpoint. No choices means easier tooling,
fewer mistakes.
* It might be reasonable to speed up the "slow" endpoint by other means, see
above.
It is also worth pointing out another pro that we already got from removing the
get-tree-head-latest endpoint. A submitter is forced to wait a bit, even for a
signed tree head. This makes it less appealing to "go with a signed tree head
because its fast". The name of the only signed tree head endpoint also
discourages usage by submitters.
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