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// Package checkmk erzeugt die Ausgabe für Checkmk im Local-Check-Format
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// (Spec 6.1): `<status> "<service>" <metriken> <text>` mit 0 OK, 1 WARN,
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// 2 CRIT. Der Text ist ASCII (Umlaute umschrieben), einzeilig.
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package checkmk
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import (
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"fmt"
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"math"
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"slices"
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"strings"
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"time"
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)
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// Schwellen (Spec 6.2 / Entscheidungen 2026-10-02).
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const (
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ContractWarnDays = 30
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ContractCritDays = 14
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OfflineCritAfter = 15 * time.Minute
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)
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const (
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statusOK = 0
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statusW = 1
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statusCrit = 2
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)
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// Tenant ist ein Mandant aus Sicht des Monitorings.
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type Tenant struct {
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ID string
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Commercial bool // Community: keine Vertragsfristen, kein Mahnwesen
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Status string
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ValidUntil time.Time
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DunningLevel int
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OverdueSince time.Time
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}
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// Node ist ein Knoten aus Sicht des Monitorings.
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type Node struct {
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ID string
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Status string // online, offline, drained
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OfflineSince time.Time
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MaintenanceActive bool
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MaintenanceUntil time.Time // Nullwert = unbefristet
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MaintenanceReason string // intern – Monitoring ist intern
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LeaseUntil time.Time // Nullwert = keine Lease
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}
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// State ist alles, was ausgegeben wird.
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type State struct {
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Tenants []Tenant
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Nodes []Node
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Violations24h int
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// OfflineCrit: ab wann ein getrennter Knoten CRIT ist (Default 15 min).
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OfflineCrit time.Duration
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// Location: Zeitzone für angezeigte Zeitpunkte (Default UTC).
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Location *time.Location
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}
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var label = map[int]string{statusOK: "OK", statusW: "WARN", statusCrit: "CRIT"}
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const day = 24 * time.Hour
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// Render liefert die Ausgabe, sortiert nach Mandant bzw. Knoten.
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func Render(s State, now time.Time) string {
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var b strings.Builder
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line := func(status int, service, metrics, text string) {
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fmt.Fprintf(&b, "%d %q %s %s - %s\n", status, service, metrics, label[status], ascii(text))
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}
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tenants := slices.Clone(s.Tenants)
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slices.SortFunc(tenants, func(a, b Tenant) int { return strings.Compare(a.ID, b.ID) })
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for _, t := range tenants {
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if !t.Commercial {
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continue
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}
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renderContract(line, t, now)
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renderPayment(line, t, now)
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}
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nodes := slices.Clone(s.Nodes)
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slices.SortFunc(nodes, func(a, b Node) int { return strings.Compare(a.ID, b.ID) })
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crit := s.OfflineCrit
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if crit <= 0 {
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crit = OfflineCritAfter
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}
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loc := s.Location
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if loc == nil {
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loc = time.UTC
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}
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for _, n := range nodes {
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renderNode(line, n, now, crit, loc)
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}
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if s.Violations24h == 0 {
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line(statusOK, "Sultan_Policy_Violations", "violations_24h=0;1", "keine Policy-Verstoesse in 24 h")
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} else {
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line(statusW, "Sultan_Policy_Violations", fmt.Sprintf("violations_24h=%d;1", s.Violations24h),
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fmt.Sprintf("%d Policy-Verstoesse in 24 h (siehe Server-Log)", s.Violations24h))
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}
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return b.String()
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}
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func renderContract(line func(int, string, string, string), t Tenant, now time.Time) {
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svc := "Sultan_Tenant_" + t.ID
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days := int(math.Floor(t.ValidUntil.Sub(now).Hours() / 24))
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metrics := func(d int) string {
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return fmt.Sprintf("days_left=%d;%d;%d", max(d, 0), ContractWarnDays, ContractCritDays)
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}
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switch {
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case t.Status == "expired" || !now.Before(t.ValidUntil):
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since := int(math.Ceil(now.Sub(t.ValidUntil).Hours() / 24))
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line(statusCrit, svc, metrics(0), fmt.Sprintf("Abo seit %d Tagen abgelaufen! Status: %s", since, t.Status))
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case t.Status == "quarantined":
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line(statusCrit, svc, metrics(days), "Mandant in Quarantaene")
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case days <= ContractCritDays:
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line(statusCrit, svc, metrics(days), fmt.Sprintf("Abo laeuft in %d Tagen ab! Verlaengerung erforderlich.", days))
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case days <= ContractWarnDays:
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line(statusW, svc, metrics(days), fmt.Sprintf("Abo laeuft in %d Tagen ab! Verlaengerung erforderlich.", days))
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default:
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line(statusOK, svc, metrics(days), fmt.Sprintf("Abo aktiv bis %s (%d Tage verbleibend)", t.ValidUntil.UTC().Format(time.DateOnly), days))
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}
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}
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func renderPayment(line func(int, string, string, string), t Tenant, now time.Time) {
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svc := "Sultan_Payment_" + t.ID
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metrics := fmt.Sprintf("dunning_level=%d;1;2", t.DunningLevel)
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if t.DunningLevel == 0 {
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line(statusOK, svc, metrics, "keine offene Zahlung")
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return
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}
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text := fmt.Sprintf("Mahnstufe %d (Zahlung seit %d Tagen offen)", t.DunningLevel, int(now.Sub(t.OverdueSince)/day))
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if t.DunningLevel >= 3 {
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text += " - Kunde offline"
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}
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status := statusW
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if t.DunningLevel >= 2 {
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status = statusCrit
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}
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line(status, svc, metrics, text)
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}
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func renderNode(line func(int, string, string, string), n Node, now time.Time, offlineCrit time.Duration, loc *time.Location) {
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svc := "Sultan_Node_" + n.ID
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leaseHours := 0
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if n.LeaseUntil.After(now) {
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leaseHours = int(n.LeaseUntil.Sub(now) / time.Hour)
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}
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metrics := fmt.Sprintf("lease_hours_left=%d", leaseHours)
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switch {
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case n.Status == "drained":
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line(statusOK, svc, metrics, "drained")
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case n.MaintenanceActive:
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text := "Wartung unbefristet"
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if !n.MaintenanceUntil.IsZero() {
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text = "Wartung bis " + n.MaintenanceUntil.In(loc).Format("2006-01-02 15:04 MST")
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}
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if n.MaintenanceReason != "" {
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text += " (" + n.MaintenanceReason + ")"
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}
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line(statusW, svc, metrics, text)
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case n.Status == "offline":
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since := now.Sub(n.OfflineSince)
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status := statusW
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if since >= offlineCrit {
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status = statusCrit
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}
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line(status, svc, metrics, "offline seit "+shortDuration(since))
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default:
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line(statusOK, svc, metrics, "online")
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}
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}
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// shortDuration: unter einer Minute in Sekunden, sonst in Minuten.
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func shortDuration(d time.Duration) string {
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if d < time.Minute {
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return fmt.Sprintf("%d s", int(d/time.Second))
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}
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return fmt.Sprintf("%d min", int(d/time.Minute))
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}
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var umlauts = strings.NewReplacer("ä", "ae", "ö", "oe", "ü", "ue", "Ä", "Ae", "Ö", "Oe", "Ü", "Ue", "ß", "ss")
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// ascii macht Text Checkmk-tauglich: einzeilig, Umlaute umschrieben,
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// übrige Nicht-ASCII-Zeichen ersetzt.
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func ascii(s string) string {
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s = umlauts.Replace(s)
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var b strings.Builder
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for _, r := range s {
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switch {
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case r == '\n' || r == '\r' || r == '\t':
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b.WriteByte(' ')
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case r < 32 || r == 127:
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case r > 127:
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b.WriteByte('?')
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default:
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b.WriteRune(r)
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}
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}
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return b.String()
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}
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