Runtime Behavior Changes

finagle-core: FailFastFactory is now disabled at runtime when a client's destination has only
one endpoint, since the client cannot do anything meaningful by breaking the circuit early.
This is recommended as a best practice anyway, now it's the default behavior. Less things
to configure and worry about! f2c100e8
finagle-core: namer annotations are prefixed with "clnt/". c8680fff
finagle-core: namer.success & namer.failure are not annotated as they are not request based.
namer.tree annotation was also removed to reduce the size of traces. c8680fff
finagle-core: The offload filter client annotation is annotated under the child request span instead of
its parent. The offload filter annotations are also changed to be binary annotations with the key
(clnt|srv)/finagle.offload_pool_size and the value being the pool size 011f096d
finagle-memcached: The key in RetrievalCommand are ommited in traces. The total number of Hits
and Misses are annotated via a counter instead under clnt/memcached.(hits/misses) 6fd0e2c9

Breaking API Changes

finagle-core: Migrated List[Tracer] to Seq[Tracer] in Tracing, and tracersCtx.
cb06890b
finagle-core: PayloadSizeFilter and WireTracingFilter are now public APIs.
fc1951a5
finagle-zipkin-core: initialSampleRate flag will now fail if the sample rate is not in the range
[0.0, 1.0]. 180f333c
finagle-mysql: mysql client annos are prefixed with clnt/ 37d55c2a

finagle-thrift: Expose c.t.f.thrift.exp.partitioning.PartitioningStrategy,
the bundled PartitioningStrategy APIs are public for experiments.
bf1d47be
finagle-http: Add LoadBalancedHostFilter to allow setting host header after LoadBalancer
5304ce69
finagle-core: Trace the request's protocol identified by the ProtocolLibrary of the client
stack. This is annotated under clnt/finagle.protocol. 464bbeb6
finagle-core: Add letTracers to allow setting multiple tracers onto the tracer stack.
cb06890b
finagle-core: DeadlineFilter now exposes a metric admission_control/deadline/remaining_ms
which tracks the remaining time in non-expired deadlines on the server side. An increase in this
stat, assuming request latency is constant and timeout configurations upstream have not changed,
may indicate that upstream services have become slower. 939f9a3e
finagle-redis: Make partitionedClient accessible. 7ba107e1
finagle-core, finagle-http, finagle-thriftmux: introduce MethodBuilder maxRetries
configuration. A ThriftMux or HTTP method can now be configured to allow a specific number of
maximum retries per request, where the retries are gated by the configured RetryBudget. This
configuration can be applied via Http.client.methodBuilder(name).withMaxRetries(n) or
ThriftMux.client.methodBuilder(name).withMaxRetries(n). 4328896d
finagle-memcached: Annotate the shard id of the backend the request will reach. 6fd0e2c9

finagle-zipkin-core: Remove flush and late-arrival annotations, which artificially extend
trace durations. 967ef1fc
finagle-core: namer annotations are added at the Service level instead of ServiceFactory as
traces are intended to be request based c8680fff