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Description
Is your feature request related to a problem? Please describe.
Right now blocks-storage.tsdb.max-exemplars is a global configuration. In a multitenant environment, if tenants that need exemplars and tenants that don't need exemplars are sharing the same ingester cluster, all tenants's TSDB will allocate a queue for exemplars even if some of them don't really need it.
Describe the solution you'd like
Make max exemplars configuration per tenant and move it to limits.
Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
Additional context
Add any other context or screenshots about the feature request here.