Currently helpers will not be injected if instrumentation doesn't
apply. Unfortunately it is possible for some classes to have context
fields added even if instrumentation is not allied (i.g. instrumented
classes are not used). Fix this by always injecting all helpers if we
inject context fields.
Previously we were inheriting from the parent and also often setting as a tag.
Apply default span assertion to verify the spanType is being checked properly. (Include error state too.)
This will allow better metric collection and identification of trends for individual services/hosts.
This is not enabled by default because it can result in a high cardinality of services.
Explain to ratpack that sending body for HEAD requests is not up to
spec [1] and seems to be confusing to clients. This resolves 'Keep-Alive'
mistery and makes disabling 'keepa-live' unnecessary.
[1] https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html
Tyler Benson
Nikolay Martynov
Andrew Kent
Gary Huang