Since version 8.x-2.6, if you have the debug flag enabled and use the memcached extension. All the records that will appear in the log will be of type error when they may not be, e.g.:
[error] MemcachedDriver::set() error key=discovery%3A-last_write_timestamp_cache_discovery error=[0]SUCCESS
If you disable debugging mode, records no longer appear in the log.
1. Use the memcached extension.
2. Activate the debug in settings.php:
$settings['memcache']['debug'] = TRUE;
3. Make sure the Memcache integration already works with 8.x-2.5. After that, update to 8.x-2.6 and clear the cache.
4. The records in the log will appear as errors.
In the MecachedDriver::set() method separate the bad results with the debug one.
Postponed: needs info
2.6
Code
Pretty sure this is fixed with 🐛 Logging is happening even with debugging off Fixed -- they were seeing the logging error the other way.