Get the library version form /healthcheck response

[cbeauchesne]

The initial solution to get library version was, at build step :

1. at lib install, run some bash command line that get the version
2. store it in a file SYSTEM_TESTS_LIBRARY_VERSION
3. then, get it in the build process thanks to a docker run weblog cat SYSTEM_TESTS_LIBRARY_VERSION
4. and put it as a env var in the weblog image with docker build --arg version=$VERSION

This mechanism offers one great advantage : for a given language, only one file must be adapted : install_ddtrace.sh script.

But it comes with some disadvantages :

1. extra build time, the docker run cat is not free
2. the bash CLI may be difficult to get it work with different library version
3. and, the worst disadvantage : the version has to be known at the build step. If this is not an issue for common CI run, it make the build step a mandatory step if the lib is modified, where in theory, it can be injected at run step, making the dev process was smoother

The disadvantage 3 has been the main motivation from getting away from the existing solution, for the nodejs library who wanted to be able to mount directly their sources at the run step.

The target solution is to get this version thanks to the healthcheck requests :

• no extra time, as this request has to be done
• can handle version issue natively without tricking bash command lines

At the non-negligible cost of requiring all weblogs to be adapted.

• C++ [cpp] Use healtcheck to get version #2799 #3206
• .NET [dotnet] Get version with healthcheck #3184
• Golang [golang] Use /healthcheck to get library version #2955
• Nodejs Use healthcheck to get weblog info in nodejs #2801
• Java [java] Implements healthcheck endpoint for all weblogs #3218
• PHP [php] Use healthcheck to get version #3208
• Python [python] Use healthcheck to get info #2799 #2907
• Ruby [ruby] Use healthcheck to get library version #2799 #3196
• java_otel [java] Implements healthcheck for java_otel #3241
• nodejs_otel [nodejs] Implements healthcheck on nodejs otel weblog #3236
• python_otel [python] Add healtcheck on python_otel weblog #3229