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// SPDX-License-Identifier: GPL-3.0-or-later
package cockroachdb
import (
"errors"
"github.com/netdata/netdata/go/go.d.plugin/pkg/prometheus"
"github.com/netdata/netdata/go/go.d.plugin/pkg/stm"
)
func validCockroachDBMetrics(scraped prometheus.Series) bool {
return scraped.FindByName("sql_restart_savepoint_count_internal").Len() > 0
}
func (c *CockroachDB) collect() (map[string]int64, error) {
scraped, err := c.prom.ScrapeSeries()
if err != nil {
return nil, err
}
if !validCockroachDBMetrics(scraped) {
return nil, errors.New("returned metrics aren't CockroachDB metrics")
}
mx := collectScraped(scraped, metrics)
calcUsableCapacity(mx)
calcUnusableCapacity(mx)
calcTotalCapacityUsedPercentage(mx)
calcUsableCapacityUsedPercentage(mx)
calcRocksDBCacheHitRate(mx)
calcActiveReplicas(mx)
calcCPUUsagePercent(mx)
return stm.ToMap(mx), nil
}
const precision = 1000
func collectScraped(scraped prometheus.Series, metricList []string) map[string]float64 {
mx := make(map[string]float64)
for _, name := range metricList {
if ms := scraped.FindByName(name); ms.Len() == 1 {
if isMetricFloat(name) {
mx[name] = ms.Max() * precision
} else {
mx[name] = ms.Max()
}
}
}
return mx
}
func calcUsableCapacity(mx map[string]float64) {
if !hasAll(mx, metricCapacityAvailable, metricCapacityUsed) {
return
}
available := mx[metricCapacityAvailable]
used := mx[metricCapacityUsed]
mx[metricCapacityUsable] = available + used
}
func calcUnusableCapacity(mx map[string]float64) {
if !hasAll(mx, metricCapacity, metricCapacityAvailable, metricCapacityUsed) {
return
}
total := mx[metricCapacity]
available := mx[metricCapacityAvailable]
used := mx[metricCapacityUsed]
mx[metricCapacityUnusable] = total - (available + used)
}
func calcTotalCapacityUsedPercentage(mx map[string]float64) {
if !hasAll(mx, metricCapacity, metricCapacityUnusable, metricCapacityUsed) {
return
}
total := mx[metricCapacity]
unusable := mx[metricCapacityUnusable]
used := mx[metricCapacityUsed]
if mx[metricCapacity] == 0 {
mx[metricCapacityUsedPercentage] = 0
} else {
mx[metricCapacityUsedPercentage] = (unusable + used) / total * 100 * precision
}
}
func calcUsableCapacityUsedPercentage(mx map[string]float64) {
if !hasAll(mx, metricCapacityUsable, metricCapacityUsed) {
return
}
usable := mx[metricCapacityUsable]
used := mx[metricCapacityUsed]
if usable == 0 {
mx[metricCapacityUsableUsedPercentage] = 0
} else {
mx[metricCapacityUsableUsedPercentage] = used / usable * 100 * precision
}
}
func calcRocksDBCacheHitRate(mx map[string]float64) {
if !hasAll(mx, metricRocksDBBlockCacheHits, metricRocksDBBlockCacheMisses) {
return
}
hits := mx[metricRocksDBBlockCacheHits]
misses := mx[metricRocksDBBlockCacheMisses]
if sum := hits + misses; sum == 0 {
mx[metricRocksDBBlockCacheHitRate] = 0
} else {
mx[metricRocksDBBlockCacheHitRate] = hits / sum * 100 * precision
}
}
func calcActiveReplicas(mx map[string]float64) {
if !hasAll(mx, metricReplicasQuiescent) {
return
}
total := mx[metricReplicas]
quiescent := mx[metricReplicasQuiescent]
mx[metricReplicasActive] = total - quiescent
}
func calcCPUUsagePercent(mx map[string]float64) {
if hasAll(mx, metricSysCPUUserPercent) {
mx[metricSysCPUUserPercent] *= 100
}
if hasAll(mx, metricSysCPUSysPercent) {
mx[metricSysCPUSysPercent] *= 100
}
if hasAll(mx, metricSysCPUCombinedPercentNormalized) {
mx[metricSysCPUCombinedPercentNormalized] *= 100
}
}
func isMetricFloat(name string) bool {
// only Float metrics (see NewGaugeFloat64 in the cockroach repo):
// - GcPausePercent, CPUUserPercent, CPUCombinedPercentNorm, AverageQueriesPerSecond, AverageWritesPerSecond
switch name {
case metricSysCPUUserPercent,
metricSysCPUSysPercent,
metricSysCPUCombinedPercentNormalized,
metricRebalancingQueriesPerSecond,
metricRebalancingWritesPerSecond:
return true
}
return false
}
func hasAll(mx map[string]float64, key string, rest ...string) bool {
_, ok := mx[key]
if len(rest) == 0 {
return ok
}
return ok && hasAll(mx, rest[0], rest[1:]...)
}
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