Merge pull request DataDog#2558 from DataDog/gus/composite

Composite behaviour description update

Merge pull request DataDog#2560 from DataDog/rochdev/signed_ids

fix tracing API using unsigned instead of signed ints

Merge pull request DataDog#2557 from DataDog/gus/promethe-update

[Prometheus] Adding join feature

Merge pull request DataDog#2559 from DataDog/gus/centos

Udpating upstart command for centOS

Merge pull request DataDog#2561 from DataDog/michael.shaughnessy/Add-…

…Description-to-Team

Add .md description to Team page

Merge pull request DataDog#2552 from DataDog/gus/prometheus

adding prometheus logo

Merge pull request DataDog#2547 from DataDog/gus/kafka-troubleshooting

Add a new use case

Merge pull request DataDog#2549 from DataDog/phrawzty/sort_advanced_c…

…heck_docs

move agent check doc & split prometheus check doc

Merge pull request DataDog#2550 from DataDog/margot.lepizzera/desc

Adding description to monitor_status page

Merge pull request DataDog#2551 from DataDog/gus/rbac-update

updating Rbac file