Core member responsibilities
Members of the *-core groups (e.g., nova-core) are responsible for making timely reviews of proposed code changes. See GerritJenkinsGithub#Reviewing_a_Change for details on when you can approve a proposed change.
Nova-core
If you are a member of nova-core, you will be assigned a review day, see Nova/ReviewDays for details.
See NovaCore if you're looking for some guidance on who to suggest as a reviewer based on the subsystem being modified.