Error: bootstrap/cache, storage, storage/framework/sessions, storage/framework/views, storage/framework/cache not writable! Run these commands as root on your LibreNMS server to fix:
chown -R librenms:librenms /opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/storage/framework/sessions /opt/librenms/storage/framework/views /opt/librenms/storage/framework/cache

setfacl -R -m g::rwx /opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/storage/framework/sessions /opt/librenms/storage/framework/views /opt/librenms/storage/framework/cache

setfacl -d -m g::rwx /opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/storage/framework/sessions /opt/librenms/storage/framework/views /opt/librenms/storage/framework/cache

If using SELinux you may also need:
semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/bootstrap/cache(/.*)?'

semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/bootstrap/cache(/.*)?'

restorecon -RFvv /opt/librenms/bootstrap/cache

semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/storage(/.*)?'

semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/storage(/.*)?'

restorecon -RFvv /opt/librenms/storage

semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/storage/framework/sessions(/.*)?'

semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/storage/framework/sessions(/.*)?'

restorecon -RFvv /opt/librenms/storage/framework/sessions

semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/storage/framework/views(/.*)?'

semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/storage/framework/views(/.*)?'

restorecon -RFvv /opt/librenms/storage/framework/views

semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/storage/framework/cache(/.*)?'

semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/storage/framework/cache(/.*)?'

restorecon -RFvv /opt/librenms/storage/framework/cache