docs: public Set<String> getAllConfiguredTenantNames() {
  
          final Settings roles = getRolesSettings();
  
          if (roles == null || roles.isEmpty()) {
              return Collections.emptySet();
          }
  
          final Set<String> configuredTenants = new HashSet<>();
          for (String sgRole : roles.names()) {
              Settings tenants = roles.getByPrefix(sgRole + ".tenants.");
  
              if (tenants != null) {
                  configuredTenants.addAll(tenants.names());
              }
  
          }
  
          return Collections.unmodifiableSet(configuredTenants);
      }