Aditya Mukerjee

#### Summary This is just #830, rebased onto #814 (for the reasons explained in #805) #### Motivation #### Test plan #### Rollout/monitoring/revert plan

Use gotest for Travis CI builds

3

#### Summary Use [gotest](https://github.com/rakyll/gotest) (courtesy of @rakyll) for Travis CI builds. Travis CI sometimes flakes because it runs in weird, resource-constrained environments. That's itself an annoyance we should figure out...

Allow non-integral values for kafka_span_sample_rate_percent

3

#### Summary Allow non-integer values for the Kafka sample rate. This allows us to sample at rates less than 1% (or rates in between integer values). #### Motivation #### Test...

Add function to expose /proc/softnet_stat data

12

#### Summary On Linux systems, we have access to network performance data at `/proc/softnet_stat`. This allows us to do things like monitor the number of packets we're dropping. This data...

Track errors when recording spans

1

#### Summary If we're encountering an error when recording a span, we want to know about it! This helps us catch situations like dropping spans due to the channel buffer...

Repeated "X is on Signal!" notifications from contacts who are not on Signal

1

- [X] I have searched open and closed issues for duplicates - [X] I am submitting a bug report for existing functionality that does not work as intended - [X]...