RuntimeException "Please configure the drupal prometheusio_bin cache" on drush updb

I have the similar issue on drush updb

  Please configure the drupal prometheusio_bin cache bin to use either  
  - cache.backend.permanent_database                                    
  - cache.backend.permanent_redis                                       
  - cache.backend.permanent_memcache 

Could you please dump the value of get_class($cacheBackend) here in the constructor and report back? (there might be other modules that are incompatible with this one)

It seems that during drush updb $cacheBackend is instance of \Drupal\Core\Update\UpdateBackend which wraps \Drupal\pcb\Cache\PermanentDatabaseBackend

Here is the patch to fast fix. Not sure if this is the best solution, it just prevent throwing the exception on any NullBackend in \Drupal\prometheusio_exporter\Prometheus\Storage\DrupalCache::__construct()

Thank you @eugene-bocharov, it's taken me a while but I finally managed to include your patch: I went with the more conservative check agains UpdateBackend, but I gave you credits in the commit.

Thank you @grota for the module and for fixing this

Automatically closed - issue fixed for 2 weeks with no activity.