I joined Datadog after the Vector acquisition and now currently am the manager for the Community Open Source Engineering team that works on Vector open source.
Just confirming strongly what ripley12 said, as a person with direct involvement in OSS at Datadog.
I haven't kept super close tabs on it but last year we were hiring for a role to do tech lead stuff and OSS community building for Vector, and yes several of the original Vector employees still work here.
What happened to Vector the last opensource they bought? Are they still hired?