loki/pkg/querier/queryrange/queryrangebase/limits.go

package queryrangebase

import (
	"context"
	"time"
)

// Limits allows us to specify per-tenant runtime limits on the behavior of
// the query handling code.
type Limits interface {
	// MaxQueryLookback returns the max lookback period of queries.
	MaxQueryLookback(context.Context, string) time.Duration

	// MaxQueryLength returns the limit of the length (in time) of a query.
	MaxQueryLength(context.Context, string) time.Duration

	// MaxQueryParallelism returns the limit to the number of split queries the
	// frontend will process in parallel.
	MaxQueryParallelism(context.Context, string) int

	// MaxCacheFreshness returns the period after which results are cacheable,
	// to prevent caching of very recent results.
	MaxCacheFreshness(context.Context, string) time.Duration
}