* Add tracing to loki

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>

* Use the op names from common/server

We don't need to the tracing middleware again. Further, the op names are
not sanitised here.

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>