Release 1.0

[beorn7]

This issue is meant to collect things blocking the v1.0 release.

• Remove the upgrade path from 0.4 storage format to 0.5 storage format from the code. It is quite confusing and essentially pre-1.0 cruft. (By using 0.5 and later, the storage format will be converted automatically. Thus, this would just mean you cannot upgrade from 0.4 or previously directly to 1.0 but have to go through 0.5 first.)
• Fix or dismiss Guard state file correctness with a checksum #101 .
• Fix Add/modify route-prefix and external-url flags to work the same as for the Prometheus server #190 .
• Fix If parameters include '/' ,It will response code 400 #97 or document that / cannot be used for grouping.
• Fix Reject inconsistent metrics at push time (and create a synthetic metric about it) #202.
• Fix Fix inconsistent HELP string across groups #194.
• Perhaps wait for certain OpenMetrics things happening (through client_golang).
• Kick out the legacy HTTP API for pushing.
• Fix Handle or avoid hash collisions #288.

[beorn7]

OpenMetrics support via client_golang is too far down the road. And if it happens, we should aim for compatible addition anyway. So I removed it as a 1.0 blocker.

[beorn7]

Sadly, I've just had the revelation that we should not forget about the unhandled hash collisions. #288

[beorn7]

Will release v0.10 today. If there are no issues with it, I'll remove the storage conversion code and release v1.0 soon.

[beorn7]

Done!