Synapse 0.21.0 is released!

Hi all,

Synapse 0.21.0 was released a moment ago. This release lands a number of performance improvements and stability fixes, plus a couple of small features.

For those of you upgrading https://github.com/matrix-org/synapse has the details as usual.  Full changelog follows:

🔗Changes in synapse v0.21.0 (2017-05-17)

Features:

• Add per user rate-limiting overrides (PR #2208)
• Add config option to limit maximum number of events requested by /sync and /messages (PR #2221) Thanks to @psaavedra!

Changes:

• Various small performance fixes (PR #2201, #2202, #2224, #2226, #2227, #2228, #2229)
• Update username availability checker API (PR #2209, #2213)
• When purging, don't de-delta state groups we're about to delete (PR #2214)
• Documentation to check synapse version (PR #2215) Thanks to @hamber-dick!
• Add an index to event_search to speed up purge history API (PR #2218)

Bug fixes:

• Fix API to allow clients to upload one-time-keys with new sigs (PR #2206)

🔗Changes in synapse v0.21.0-rc2 (2017-05-08)

Changes:

• Always mark remotes as up if we receive a signed request from them (PR #2190)

Bug fixes:

• Fix bug where users got pushed for rooms they had muted (PR #2200)

🔗Changes in synapse v0.21.0-rc1 (2017-05-08)

Features:

• Add username availability checker API (PR #2183)
• Add read marker API (PR #2120)

Changes:

• Enable guest access for the 3pl/3pid APIs (PR #1986)
• Add setting to support TURN for guests (PR #2011)
• Various performance improvements (PR #2075, #2076, #2080, #2083, #2108, #2158, #2176, #2185)
• Make synctl a bit more user friendly (PR #2078, #2127) Thanks @APwhitehat!
• Replace HTTP replication with TCP replication (PR #2082, #2097, #2098, #2099, #2103, #2014, #2016, #2115, #2116, #2117)
• Support authenticated SMTP (PR #2102) Thanks @DanielDent!
• Add a counter metric for successfully-sent transactions (PR #2121)
• Propagate errors sensibly from proxied IS requests (PR #2147)
• Add more granular event send metrics (PR #2178)

Bug fixes:

• Fix nuke-room script to work with current schema (PR #1927) Thanks @zuckschwerdt!
• Fix db port script to not assume postgres tables are in the public schema (PR #2024) Thanks @jerrykan!
• Fix getting latest device IP for user with no devices (PR #2118)
• Fix rejection of invites to unreachable servers (PR #2145)
• Fix code for reporting old verify keys in synapse (PR #2156)
• Fix invite state to always include all events (PR #2163)
• Fix bug where synapse would always fetch state for any missing event (PR #2170)
• Fix a leak with timed out HTTP connections (PR #2180)
• Fix bug where we didn't time out HTTP requests to ASes (PR #2192)

Docs:

• Clarify doc for SQLite to PostgreSQL port (PR #1961) Thanks @benhylau!
• Fix typo in synctl help (PR #2107) Thanks @HarHarLinks!
• web_client_location documentation fix (PR #2131) Thanks @matthewjwolff!
• Update README.rst with FreeBSD changes (PR #2132) Thanks @feld!
• Clarify setting up metrics (PR #2149) Thanks @encks!