Streamline HTTP error by using the same representation as cloud 2. Also
ensure that only internal server errors result in an error-level log
entry.
Fixes#3075.
* feat: migrate server to DbWrite (#2724)
* chore: print perf log output
* fix: don't suppress CI status code
* chore: review feedback
* fix: don't error on empty line protocol write payloads
* fix: test
* fix: test
Marco Neumann
Raphael Taylor-Davies