spans are lost when connection to collector endpoint resets

[rghetia]

For interoperability test OC-Agent is used to send spans to test-coordinator. If test-coordinator is restarted then then a new tcp connection is established and the old one is in TIME_WAIT state. There is a period of time for which spans are lost even though the new connection is in ESTABLISHED state.

When then old connection is removed entirely then spans resume.

[songy23]

/cc @odeke-em

[odeke-em]

Thank you for reporting this issue @rghetia and @songy23 for the ping!

Currently we use a bundler with a wait time as well when buffering spans to sends, but let's also ensure that on failed connection that we put spans into some sort of storage e.g. a circular buffer and send them once reconnection happens!