Module cartridge.issues

Monitor issues across cluster instances.

Cartridge detects the following problems:

Replication:

• critical: «Replication from … to … isn’t running» - when box.info.replication.upstream == nil ;
• critical: «Replication from … to … state «stopped»/»orphan»/etc. (…)»;
• warning: «Replication from … to …: high lag» - when upstream.lag > box.cfg.replication_sync_lag ;
• warning: «Replication from … to …: long idle» - when upstream.idle > 2 * box.cfg.replication_timeout ;

Failover:

• warning: «Can’t obtain failover coordinator (…)»;
• warning: «There is no active failover coordinator»;
• warning: «Failover is stuck on …: Error fetching appointments (…)»;
• warning: «Failover is stuck on …: Failover fiber is dead» - this is likely a bug;

Switchover:

• warning: «Consistency on … isn’t reached yet»;

Clock:

• warning: «Clock difference between … and … exceed threshold» limits.clock_delta_threshold_warning ;

Memory:

• critical: «Running out of memory on …» - when all 3 metrics items_used_ratio, arena_used_ratio, quota_used_ratio from box.slab.info() exceed limits.fragmentation_threshold_critical ;
• warning: «Memory is highly fragmented on …» - when items_used_ratio > limits.fragmentation_threshold_warning and both arena_used_ratio, quota_used_ratio exceed critical limit;

Configuration:

• warning: «Configuration checksum mismatch on …»;
• warning: «Configuration is prepared and locked on …»;
• warning: «Advertise URI (…) differs from clusterwide config (…)»;
• warning: «Configuring roles is stuck on … and hangs for … so far»;

Alien members:

• warning: «Instance … with alien uuid is in the membership» - when two separate clusters share the same cluster cookie;