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// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package metrics

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

const (
	DataGetLabel    = "get"
	DataPutLabel    = "put"
	DataRemoveLabel = "remove"
	DataListLabel   = "list"
	DataStatLabel   = "stat"

	persistentDataOpType = "persistent_data_op_type"
)

var (
	PersistentDataKvSize = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: milvusNamespace,
			Subsystem: "storage",
			Name:      "kv_size",
			Help:      "kv size stats",
			Buckets:   buckets,
		}, []string{persistentDataOpType})

	PersistentDataRequestLatency = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Namespace: milvusNamespace,
			Subsystem: "storage",
			Name:      "request_latency",
			Help:      "request latency on the client side ",
			Buckets:   buckets,
		}, []string{persistentDataOpType})

	PersistentDataOpCounter = prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Namespace: milvusNamespace,
			Subsystem: "storage",
			Name:      "op_count",
			Help:      "count of persistent data operation",
		}, []string{persistentDataOpType, statusLabelName})
)

// RegisterStorageMetrics registers storage metrics
func RegisterStorageMetrics(registry *prometheus.Registry) {
	registry.MustRegister(PersistentDataKvSize)
	registry.MustRegister(PersistentDataRequestLatency)
	registry.MustRegister(PersistentDataOpCounter)
}