Prometheus: Adjust step for queries #481
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Previously, step in queries to Prometheus was static and this resulted in
exceeded maximum resolution of 11,000 points per timeserieserrors on a wider time ranges.This PR adds adjusting step to respect the provided constraints. It also rounds the step to match the steps scale in use by Grafana. The constraint is defaulted to the Prometheus 11k and is configurable via
max_points_per_querybackendOptionsoption