Having never used Rust: how's the ecosystem around it like for maintaining it on production servers? Are there equivalents of Java Mission Control and `jcmd`?
The ecosystem is good and growing, but not as extensive as java, of course. We use generic cloud monitoring/SRE tools (think statsd, not jcmd, for example). From prior experience, I also think JVMs somehow tend to require more of this kind of tooling, compared to Rust - or, for that matter, other languages & runtimes.
I'm curious how much Java needs the tooling in an all else equal situation (totally possible 'cuz Java is _old_) vs how much Java has all this cool tooling that enables/encourages people to do things that aren't possible in Go but which require the tooling.
I've mostly used the Java, C++ and Go in my career, and it's pretty amazing to me that I can write write safe, readable code (like Go) on top of high-performance libraries (like C++) and step through code on a prod machine with a remote debugger, get live performance metrics with a single CLI command, etc.
Not in the same way. Since there's no significant runtime behind rust, there's no specific way to query it in an abstract way. On the other hand, native code means that you can use any common way to query the system. Anything you'd use for C or C++ will work as well. Profilers, stack querying, monitoring the process itself, user-level probes, etc. will work just fine. There's lots of tools that will work for this.
