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marcinbudny / eventstore_exporter

EventStoreDB (https://eventstore.com/eventstoredb/) metrics Prometheus exporter.
MIT License
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[Feature Request]: Monitor - Subscription / status / # of msgs #33

Closed ILyress closed 1 year ago

ILyress commented 1 year ago

Hi

I'm trying to add your exporter in my cluster, but I can't find how to monitor the field "Status # of msgs / estimated time to catchup in seconds" in the subscription panel.

is it possible with this export to monitor this field of subscription panel ? and if not do you intend to add it in a future update pls ?

Status_of_msgs_estimated_time_to_catchup_in_seconds

marcinbudny commented 1 year ago

Hi,

The values presented in this column are not directly available in the subscription statistics published by the server. However the ESDB UI seems to calculate these values based on other data that sever publishes, and this exporter exports most of it.

So e.g. rate of messages would be calculated from eventstore_subscription_items_processed_total metric. Similarly number of messages left to process would be eventstore_subscription_last_known_event_number - eventstore_subscription_last_processed_event_number. And then from rate and number of messages to process you'd get the estimated time to catch up.