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diff --git a/doc/administration/troubleshooting/defcon.md b/doc/administration/troubleshooting/defcon.md new file mode 100644 index 00000000000..09e11553d97 --- /dev/null +++ b/doc/administration/troubleshooting/defcon.md @@ -0,0 +1,25 @@ +--- +stage: Enablement +group: Distribution +info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments +type: reference +--- + +# Disaster Recovery + +This document describes a feature that allows to easily disable some important but computationally +expensive parts of the application, in order to relieve stress on the database in an ongoing downtime. + +## `ci_queueing_disaster_recovery` + +This feature flag, if enabled temporarily disables fair scheduling on shared runners. +This can help reduce system resource usage on the `jobs/request` endpoint +by significantly reducing computations being performed. + +Side effects: + +- In case of a large backlog of jobs, the jobs will be processed in the order +they were put in the system instead of balancing the jobs across many projects +- Projects which are out of quota will be run. This affects +only jobs that were created during the last hour, as prior jobs are canceled +by a periodic background worker (`StuckCiJobsWorker`). |