There's a bunch of debug- and trace-level logging of locator::node-s that also include current_backtrace(). Printing node is done via debug_format() helper that generates and returns an sstring to print. Backtrace printing is not very lightweight on its own because of backtrace collecting. Not to slow things down in info log level, which is default, all such prints are wrapped with explicit if-s about log-level being enabled or not.
This PR removes those level checks by introducing lazy_backtrace() helper and by providing a formatter for nodes that also results in lazy node format string calculation.
Closesscylladb/scylladb#17235
* github.com:scylladb/scylladb:
topology: Restore indentation after previous patch
topology: Drop if_enabled checks for logging
topology: Add lazy_backtrace() helper
topology: Add printer wrapper for node* and formatter for it
topology: Expand formatter<locator::node>
42a76ca568