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Redis Data Structure

ZMON stores its primary working data in Redis. This page describes the used Redis keys and data structures.

Queues are Redis keys like zmon:queue:<NAME> of type "list", e.g. zmon:queue:default.

New queue items are added by the ZMON Scheduler via the Redis "rpush" command.

Important Redis key patterns are:

zmon:queue:<QUEUE-NAME>
List of worker tasks for given queue.
zmon:checks
Set of all executed check IDs.
zmon:checks:<CHECK-ID>
Set of entity IDs having check results.
zmon:checks:<CHECK-ID>:<ENTITY-ID>
List of last N check results. The first list item contains the most recent check result. Each check result is a JSON object with the keys ts (result timestamp), td (check duration), value (actual result value) and worker (ID of worker having produced the check result).
zmon:alerts
Set of all active alert IDs.
zmon:alerts:<ALERT-ID>
Set of entity IDs in alert state.
zmon:alerts:<ALERT-ID>:entities
Hash of entity IDs to alert captures. This hash contains all entity IDs matched by the alert, i.e. not only entities in alert state.
zmon:alerts:<ALERT-ID>:<ENTITY-ID>
Alert detail JSON containing alert start time, captures, worker, etc.
zmon:downtimes
Set of all alert IDs having downtimes.
zmon:downtimes:<ALERT-ID>
Set of all entity IDs having a downtime for this alert.
zmon:downtimes:<ALERT-ID>:<ENTITY-ID>
Hash of downtimes for this entity/alert. Each hash value is a JSON object with keys start_time, end_time and comment.
zmon:active_downtimes
Set of currently active downtimes. Each set item has the form <ALERT-ID>:<ENTITY-ID>:<DOWNTIME-ID>.
zmon:metrics
Set of worker and scheduler IDs with metrics.
zmon:metrics:<WORKER-OR-SCHEDULER-ID>:ts
Timestamp of last worker or scheduler metrics update.
zmon:metrics:<WORKER-OR-SCHEDULER-ID>:check.count
Increasing counter of executed (or scheduled) checks.