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mem.go
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mem.go
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package metrics
import (
"bytes"
"fmt"
"regexp"
"text/template"
"github.com/prometheus/common/model"
alertingv1 "github.com/rancher/opni/pkg/apis/alerting/v1"
"golang.org/x/exp/slices"
"google.golang.org/protobuf/types/known/durationpb"
)
const MemoryDeviceFilter = "device"
const MemoryMatcherName = "node_memory_.*_bytes"
var MemoryUsageTypeExtractor = regexp.MustCompile("node_memory_(.*)_bytes")
var MemoryMatcherRegexFilter = []string{"Buffers", "Cached", "MemFree", "Slab"}
var MemRuleAnnotations = map[string]string{}
type memorySaturation struct {
Filters string
Operation string
ExpectedValue string
}
type memorySaturationSpike struct {
Filters string
Operation string
ExpectedValue string
SpikeWindow string
NumSpike string
}
func NewMemRule(
deviceFilters map[string]*alertingv1.MemoryInfo,
usageTypes []string,
operation string,
expectedRatio float64,
duration *durationpb.Duration,
annotations map[string]string,
) (*AlertingRule, error) {
dur := model.Duration(duration.AsDuration())
filters := NewPrometheusFilters()
filters.AddFilter(NodeFilter)
for node, state := range deviceFilters {
filters.Or(NodeFilter, node)
for _, device := range state.Devices {
filters.Or(MemoryDeviceFilter, device)
}
}
filters.Match(NodeFilter)
outputFilters := filters.Build()
aggrMetrics := ""
for _, utype := range usageTypes {
if !slices.Contains(MemoryMatcherRegexFilter, utype) {
continue // FIXME: warn
}
if aggrMetrics != "" {
aggrMetrics += " + "
}
aggrMetrics += fmt.Sprintf("node_memory_%s_bytes%s", utype, outputFilters)
}
tmpl := template.Must(template.New("").Parse(`
(1 - (
{{ .AggrMetrics }}
)
/
node_memory_MemTotal_bytes{{ .Filters }}
) {{ .Operation }} bool {{ .ExpectedValue }}
`))
var b bytes.Buffer
err := tmpl.Execute(&b, map[string]string{
"Filters": filters.Build(),
"AggrMetrics": aggrMetrics,
"Operation": operation,
"ExpectedValue": fmt.Sprintf("%.7f", expectedRatio),
})
if err != nil {
return nil, err
}
return &AlertingRule{
Alert: "",
Expr: PostProcessRuleString(b.String()),
For: dur,
Labels: annotations,
Annotations: annotations,
}, nil
}
func NewMemSpikeRule(
deviceFilters map[string]*alertingv1.MemoryInfo,
usageTypes []string,
operation string,
expectedRatio float64,
numSpikes int64,
duration *durationpb.Duration,
spikeWindow *durationpb.Duration,
annotations map[string]string,
) (*AlertingRule, error) {
dur := model.Duration(duration.AsDuration())
spikeDur := model.Duration(spikeWindow.AsDuration())
filters := NewPrometheusFilters()
filters.AddFilter(NodeFilter)
for node, state := range deviceFilters {
filters.Or(NodeFilter, node)
for _, device := range state.Devices {
filters.Or(MemoryDeviceFilter, device)
}
}
filters.Match(NodeFilter)
outputFilters := filters.Build()
aggrMetrics := ""
for _, utype := range usageTypes {
if !slices.Contains(MemoryMatcherRegexFilter, utype) {
continue // FIXME: warn
}
if aggrMetrics != "" {
aggrMetrics += " + "
}
aggrMetrics += fmt.Sprintf("node_memory_%s_bytes%s", utype, outputFilters)
}
tmpl := template.Must(template.New("").Parse(`
count_over_time(
((
1 -
(
{{ .AggrMetrics }}
)
/
node_memory_MemTotal_bytes{{ .Filters }}
) {{ .Operation }} bool {{ .ExpectedValue }})[{{ .SpikeWindow }}:5s]) > {{ .NumSpikes }}
`))
var b bytes.Buffer
err := tmpl.Execute(&b, map[string]string{
"Filters": filters.Build(),
"AggrMetrics": aggrMetrics,
"Operation": operation,
"ExpectedValue": fmt.Sprintf("%.7f", expectedRatio),
"SpikeWindow": spikeDur.String(),
"NumSpikes": fmt.Sprintf("%d", numSpikes),
})
if err != nil {
return nil, err
}
return &AlertingRule{
Alert: "",
Expr: PostProcessRuleString(b.String()),
For: dur,
Labels: annotations,
Annotations: annotations,
}, nil
}