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»;

Vshard:

• various vshard alerts (see vshard docs for details);
• warning: «Group «…» wasn’t bootstrapped: …»;
• warning: Vshard storages in replicaset %s marked as «all writable».

Alien members:

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

Expelled instances:

• warning: «Replicaset … has expelled instance … in box.space._cluster» - when instance was expelled from replicaset, but still remains in box.space._cluster;

Deprecated space format:

• warning: «Instance … has spaces with deprecated format: space1, …»

Raft issues:

• warning: «Raft leader idle is 10.000 on … . Is raft leader alive and connection is healthy?»

Unhealthy replicasets:

• critical: «All instances are unhealthy in replicaset … «.

Custom issues (defined by user):

• Custom roles can announce more issues with their own level, topic and message. See custom-role.get_issues.

GraphQL request:

You can get info about cluster issues using the following GrapQL request:

{
    cluster {
        issues {
            level
            message
            replicaset_uuid
            instance_uuid
            topic
         }
     }
 }