This is a more generic form of the previous `split-by-domain` and `split-by-instance`.
(Note: evaluation is done when a tag is set, so If multiple tags are configured, the last tag set will take precidence.)
For example, this setting can be used to rename `aws-sdk` spans to be identified with the corresponding `aws.service` tag:
```
-Ddd.trace.split-by-tags=aws.service
```
There are some slight differences with this setting compared with`dd.trace.http.client.split-by-domain` and `dd.trace.db.client.split-by-instance`. `split-by-tags` applies to every span, where `split-by-domain` and `split-by-instance` only apply to http and db client spans respectively.
The core changes are in Config and ServerDecorator.
Moved default tagging from Config::getRuntimeTags to Config::getLocalRootSpanTags. This changes the result of Config::getMergedJmxTags as well.
To preserve language for servers changed ServerDecorator::afterStart.
Other changes are in tests - the most complicated part is in TagsAssert::defaultTags. This now contains a bit too much conditional logic for my liking.
Expose new options for configuring JMXFetch with standard datadog-agent config files with `jvm_direct: true` set as an instance attribute (this will be ignored by the datadog-agent).
For Example:
* `dd.agent.conf.d=/opt/datadog-agent/etc/conf.d`
* `dd.jmxfetch.configs=activemq.d/conf.yaml,jmx.d/conf.yaml`
will load jmx configs in those two files that have `jvm_direct: true` in their `instance` setup.
Environment variables can also be used: `DD_AGENT_CONF_D` and `DD_JMXFETCH_CONFIGS`
Depends on https://github.com/DataDog/jmxfetch/releases/tag/0.29.0 being released.
The naming of methods in DDSpan used to detect/retrieve the root span
for a fiven span were slightly misleading. Specifically 'isRootSpan()'
returned true if and only if the span is the root span of teh entire
trace(even in the context of distributed tracing), while getRootSpan()
return the root span of the trace fragment generated by the currently
traced application. I hope that trenaming such methods to
'isTraceRootSpan()' and 'getApplicationRootSpan()' respectively will
help adding some clarity.
The old method names have not been removed for backward comptibility
reasons and tests have been added, but they have been marked as
deprecated.
Nikolay Martynov
Tyler Benson
Douglas Q Hawkins
dougqh
Alex Antonov
Laplie Anderson
Luca Abbati
Luca Abbati