// Copyright 2018 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

package metrics

import (
	"github.com/prometheus/client_golang/prometheus"
)

// distsql metrics.
var (
	DistSQLQueryHistgram = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: "tidb",
			Subsystem: "distsql",
			Name:      "handle_query_duration_seconds",
			Help:      "Bucketed histogram of processing time (s) of handled queries.",
			Buckets:   prometheus.ExponentialBuckets(0.0005, 2, 13),
		}, []string{LblType})

	DistSQLScanKeysPartialHistogram = prometheus.NewHistogram(
		prometheus.HistogramOpts{
			Namespace: "tidb",
			Subsystem: "distsql",
			Name:      "scan_keys_partial_num",
			Help:      "number of scanned keys for each partial result.",
		},
	)
	DistSQLScanKeysHistogram = prometheus.NewHistogram(
		prometheus.HistogramOpts{
			Namespace: "tidb",
			Subsystem: "distsql",
			Name:      "scan_keys_num",
			Help:      "number of scanned keys for each query.",
		},
	)
	DistSQLPartialCountHistogram = prometheus.NewHistogram(
		prometheus.HistogramOpts{
			Namespace: "tidb",
			Subsystem: "distsql",
			Name:      "partial_num",
			Help:      "number of partial results for each query.",
		},
	)
)

func init() {
	prometheus.MustRegister(DistSQLQueryHistgram)
	prometheus.MustRegister(DistSQLScanKeysPartialHistogram)
	prometheus.MustRegister(DistSQLScanKeysHistogram)
	prometheus.MustRegister(DistSQLPartialCountHistogram)
}