API Changes

balancer: remove Header from PickOptions; it is also available through context (#2674)

Behavior Changes

credentials: add compute engine creds (#2708)
grpclb: fallback after init (#2681)
server: improve error message when an unknown method is invoked. (#2723)
balancer: add server loads from RPC trailers to DoneInfo (#2641)
service config: default service config (#2686)
bar: add ability to update resolver state atomically and pass directly to the balancer (#2693)
stats: add Trailer to client-side stats.End (#2639)
- Special Thanks: @mklencke

internal: update golang.org/x/lint dependency (#2690)
syscall: remove logging in init(). (#2734)
- Special Thanks: @yangminzhu
transport: do not close channel that can lead to panic (#2695)
- Special Thanks: @aanm
grpclb: drop only when at least one SubConn is ready (#2630)
stats: add WireLength to stats.InPayload (#2711)
- Special Thanks: @ilylia
client: restore remote address in traces (#2718)
server: send RST_STREAM after trailers if client has not half-closed (#2684)
channelz: cleanup channel registration if Dial fails (#2733)
client: handle HTTP header parsing error correctly (#2599)
grpclb: keep drop index unless a new serverlist is received (#2631)
client: reset backoff to 0 after a connection is established (#2669)
dns: prefixing txt record lookup with "_grpc_config." (#2691)
balancer: make sure non-nil done returned by Pick is called (#2688)