Changes in synapse v0.28.0-rc1 (2018-04-26)

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Bug Fixes:

* Fix quarantine media admin API and search reindex (PR #3130)
* Fix media admin APIs (PR #3134)

Changes in synapse v0.28.0-rc1 (2018-04-24)
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Minor performance improvement to federation sending and bug fixes.

(Note: This release does not include state resolutions discussed in matrix live)

Features:

* Add metrics for event processing lag (PR #3090)
* Add metrics for ResponseCache (PR #3092)

Changes:

* Synapse on PyPy (PR #2760) Thanks to @Valodim!
* move handling of auto_join_rooms to RegisterHandler (PR #2996) Thanks to @krombel!
* Improve handling of SRV records for federation connections (PR #3016) Thanks to @silkeh!
* Document the behaviour of ResponseCache (PR #3059)
* Preparation for py3 (PR #3061, #3073, #3074, #3075, #3103, #3104, #3106, #3107, #3109, #3110) Thanks to @NotAFile!
* update prometheus dashboard to use new metric names (PR #3069) Thanks to @krombel!
* use python3-compatible prints (PR #3074) Thanks to @NotAFile!
* Send federation events concurrently (PR #3078)
* Limit concurrent event sends for a room (PR #3079)
* Improve R30 stat definition (PR #3086)
* Send events to ASes concurrently (PR #3088)
* Refactor ResponseCache usage (PR #3093)
* Clarify that SRV may not point to a CNAME (PR #3100) Thanks to @silkeh!
* Use str(e) instead of e.message (PR #3103) Thanks to @NotAFile!
* Use six.itervalues in some places (PR #3106) Thanks to @NotAFile!
* Refactor store.have_events (PR #3117)

Bug Fixes:

* Return 401 for invalid access_token on logout (PR #2938) Thanks to @dklug!
* Return a 404 rather than a 500 on rejoining empty rooms (PR #3080)
* fix federation_domain_whitelist (PR #3099)
* Avoid creating events with huge numbers of prev_events (PR #3113)
* Reject events which have lots of prev_events (PR #3118)