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cluster_settings.go
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cluster_settings.go
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// Copyright 2021 The Prometheus Authors
// 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,
// 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 collector
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/imdario/mergo"
"github.com/prometheus/client_golang/prometheus"
)
func init() {
registerCollector("clustersettings", defaultDisabled, NewClusterSettings)
}
type ClusterSettingsCollector struct {
logger log.Logger
u *url.URL
hc *http.Client
}
func NewClusterSettings(logger log.Logger, u *url.URL, hc *http.Client) (Collector, error) {
return &ClusterSettingsCollector{
logger: logger,
u: u,
hc: hc,
}, nil
}
var clusterSettingsDesc = map[string]*prometheus.Desc{
"shardAllocationEnabled": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_stats", "shard_allocation_enabled"),
"Current mode of cluster wide shard routing allocation settings.",
nil, nil,
),
"maxShardsPerNode": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_stats", "max_shards_per_node"),
"Current maximum number of shards per node setting.",
nil, nil,
),
"thresholdEnabled": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_allocation", "threshold_enabled"),
"Is disk allocation decider enabled.",
nil, nil,
),
"floodStageRatio": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_allocation_watermark", "flood_stage_ratio"),
"Flood stage watermark as a ratio.",
nil, nil,
),
"highRatio": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_allocation_watermark", "high_ratio"),
"High watermark for disk usage as a ratio.",
nil, nil,
),
"lowRatio": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_allocation_watermark", "low_ratio"),
"Low watermark for disk usage as a ratio.",
nil, nil,
),
"floodStageBytes": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_allocation_watermark", "flood_stage_bytes"),
"Flood stage watermark as in bytes.",
nil, nil,
),
"highBytes": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_allocation_watermark", "high_bytes"),
"High watermark for disk usage in bytes.",
nil, nil,
),
"lowBytes": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "clustersettings_allocation_watermark", "low_bytes"),
"Low watermark for disk usage in bytes.",
nil, nil,
),
}
// clusterSettingsResponse is a representation of a Elasticsearch Cluster Settings
type clusterSettingsResponse struct {
Defaults clusterSettingsSection `json:"defaults"`
Persistent clusterSettingsSection `json:"persistent"`
Transient clusterSettingsSection `json:"transient"`
}
// clusterSettingsSection is a representation of a Elasticsearch Cluster Settings
type clusterSettingsSection struct {
Cluster clusterSettingsCluster `json:"cluster"`
}
// clusterSettingsCluster is a representation of a Elasticsearch clusterSettingsCluster Settings
type clusterSettingsCluster struct {
Routing clusterSettingsRouting `json:"routing"`
// This can be either a JSON object (which does not contain the value we are interested in) or a string
MaxShardsPerNode interface{} `json:"max_shards_per_node"`
}
// clusterSettingsRouting is a representation of a Elasticsearch Cluster shard routing configuration
type clusterSettingsRouting struct {
Allocation clusterSettingsAllocation `json:"allocation"`
}
// clusterSettingsAllocation is a representation of a Elasticsearch Cluster shard routing allocation settings
type clusterSettingsAllocation struct {
Enabled string `json:"enable"`
Disk clusterSettingsDisk `json:"disk"`
}
// clusterSettingsDisk is a representation of a Elasticsearch Cluster shard routing disk allocation settings
type clusterSettingsDisk struct {
ThresholdEnabled string `json:"threshold_enabled"`
Watermark clusterSettingsWatermark `json:"watermark"`
}
// clusterSettingsWatermark is representation of Elasticsearch Cluster shard routing disk allocation watermark settings
type clusterSettingsWatermark struct {
FloodStage string `json:"flood_stage"`
High string `json:"high"`
Low string `json:"low"`
}
func (c *ClusterSettingsCollector) Update(ctx context.Context, ch chan<- prometheus.Metric) error {
u := c.u.ResolveReference(&url.URL{Path: "_cluster/settings"})
q := u.Query()
q.Set("include_defaults", "true")
u.RawQuery = q.Encode()
req, err := http.NewRequestWithContext(ctx, "GET", u.String(), nil)
if err != nil {
return err
}
resp, err := c.hc.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
b, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
var data clusterSettingsResponse
err = json.Unmarshal(b, &data)
if err != nil {
return err
}
// Merge all settings into one struct
merged := data.Defaults
err = mergo.Merge(&merged, data.Persistent, mergo.WithOverride)
if err != nil {
return err
}
err = mergo.Merge(&merged, data.Transient, mergo.WithOverride)
if err != nil {
return err
}
// Max shards per node
if maxShardsPerNodeString, ok := merged.Cluster.MaxShardsPerNode.(string); ok {
maxShardsPerNode, err := strconv.ParseInt(maxShardsPerNodeString, 10, 64)
if err == nil {
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["maxShardsPerNode"],
prometheus.GaugeValue,
float64(maxShardsPerNode),
)
}
}
// Shard allocation enabled
shardAllocationMap := map[string]int{
"all": 0,
"primaries": 1,
"new_primaries": 2,
"none": 3,
}
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["shardAllocationEnabled"],
prometheus.GaugeValue,
float64(shardAllocationMap[merged.Cluster.Routing.Allocation.Enabled]),
)
// Threshold enabled
thresholdMap := map[string]int{
"false": 0,
"true": 1,
}
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["thresholdEnabled"],
prometheus.GaugeValue,
float64(thresholdMap[merged.Cluster.Routing.Allocation.Disk.ThresholdEnabled]),
)
// Watermark bytes or ratio metrics
if strings.HasSuffix(merged.Cluster.Routing.Allocation.Disk.Watermark.High, "b") {
flooodStageBytes, err := getValueInBytes(merged.Cluster.Routing.Allocation.Disk.Watermark.FloodStage)
if err != nil {
level.Error(c.logger).Log("msg", "failed to parse flood_stage bytes", "err", err)
} else {
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["floodStageBytes"],
prometheus.GaugeValue,
flooodStageBytes,
)
}
highBytes, err := getValueInBytes(merged.Cluster.Routing.Allocation.Disk.Watermark.High)
if err != nil {
level.Error(c.logger).Log("msg", "failed to parse high bytes", "err", err)
} else {
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["highBytes"],
prometheus.GaugeValue,
highBytes,
)
}
lowBytes, err := getValueInBytes(merged.Cluster.Routing.Allocation.Disk.Watermark.Low)
if err != nil {
level.Error(c.logger).Log("msg", "failed to parse low bytes", "err", err)
} else {
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["lowBytes"],
prometheus.GaugeValue,
lowBytes,
)
}
return nil
}
// Watermark ratio metrics
floodRatio, err := getValueAsRatio(merged.Cluster.Routing.Allocation.Disk.Watermark.FloodStage)
if err != nil {
level.Error(c.logger).Log("msg", "failed to parse flood_stage ratio", "err", err)
} else {
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["floodStageRatio"],
prometheus.GaugeValue,
floodRatio,
)
}
highRatio, err := getValueAsRatio(merged.Cluster.Routing.Allocation.Disk.Watermark.High)
if err != nil {
level.Error(c.logger).Log("msg", "failed to parse high ratio", "err", err)
} else {
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["highRatio"],
prometheus.GaugeValue,
highRatio,
)
}
lowRatio, err := getValueAsRatio(merged.Cluster.Routing.Allocation.Disk.Watermark.Low)
if err != nil {
level.Error(c.logger).Log("msg", "failed to parse low ratio", "err", err)
} else {
ch <- prometheus.MustNewConstMetric(
clusterSettingsDesc["lowRatio"],
prometheus.GaugeValue,
lowRatio,
)
}
return nil
}
func getValueInBytes(value string) (float64, error) {
type UnitValue struct {
unit string
val float64
}
unitValues := []UnitValue{
{"pb", 1024 * 1024 * 1024 * 1024 * 1024},
{"tb", 1024 * 1024 * 1024 * 1024},
{"gb", 1024 * 1024 * 1024},
{"mb", 1024 * 1024},
{"kb", 1024},
{"b", 1},
}
for _, uv := range unitValues {
if strings.HasSuffix(value, uv.unit) {
numberStr := strings.TrimSuffix(value, uv.unit)
number, err := strconv.ParseFloat(numberStr, 64)
if err != nil {
return 0, err
}
return number * uv.val, nil
}
}
return 0, fmt.Errorf("failed to convert unit %s to bytes", value)
}
func getValueAsRatio(value string) (float64, error) {
if strings.HasSuffix(value, "%") {
percentValue, err := strconv.Atoi(strings.TrimSpace(strings.TrimSuffix(value, "%")))
if err != nil {
return 0, err
}
return float64(percentValue) / 100, nil
}
ratio, err := strconv.ParseFloat(value, 64)
if err != nil {
return 0, err
}
return ratio, nil
}