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feat: enhance scheduler health API with rich instance metadata

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Add comprehensive instance-level diagnostics to /api/monitoring/scheduler/health

**New Response Structure:**

Enhanced "instances" array with per-instance details:
- Instance metadata: displayName, type, connection URL
- Poll status: last success/error timestamps, error messages, error category
- Circuit breaker: state, timestamps, failure counts, retry windows
- Dead letter: present flag, reason, attempt history, retry schedule

**Implementation:**

Data structures:
- instanceInfo: cache of display names, URLs, types
- pollStatus: tracks successes/errors with timestamps and categories
- dlqInsight: DLQ entry metadata (reason, attempts, schedule)
- circuitBreaker: enhanced with stateSince, lastTransition

Tracking logic:
- buildInstanceInfoCache: populate metadata from config on startup
- recordTaskResult: track poll outcomes, error details, categories
- sendToDeadLetter: capture DLQ insights (reason, timestamps)
- circuitBreaker: record state transitions with timestamps

**Backward Compatible:**
- Existing fields (deadLetter, breakers, staleness) unchanged
- New "instances" array is additive
- Old clients can ignore new fields

**Testing:**
- Unit test: TestSchedulerHealth_EnhancedResponse validates all fields
- Integration tests: still passing (55s)
- All error tracking and breaker history verified

**Operator Benefits:**
- Diagnose issues without log digging
- See error messages directly in API
- Understand breaker states and retry schedules
- Track DLQ entries with full context
- Single API call for complete instance health view

Example: Quickly identify "401 unauthorized" on specific PBS instance,
see it's in DLQ after 5 retries, and know when next retry scheduled.

Part of Phase 2 follow-up work to improve observability.
This commit is contained in:
rcourtman 2025-10-20 14:24:59 +00:00
parent 0fcfad3dc5
commit 9b1709a05b
4 changed files with 512 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
internal/monitoring/circuit_breaker.go
View file

@ -23,6 +23,8 @@ type circuitBreaker struct {
maxDelay time.Duration
openThreshold int
halfOpenWindow time.Duration
stateSince time.Time
lastTransition time.Time
}
func newCircuitBreaker(openThreshold int, retryInterval, maxDelay, halfOpenWindow time.Duration) *circuitBreaker {
@ -38,13 +40,16 @@ func newCircuitBreaker(openThreshold int, retryInterval, maxDelay, halfOpenWindo
if halfOpenWindow <= 0 {
halfOpenWindow = 30 * time.Second
}
return &circuitBreaker{
state: breakerClosed,
retryInterval: retryInterval,
maxDelay: maxDelay,
openThreshold: openThreshold,
halfOpenWindow: halfOpenWindow,
}
now := time.Now()
return &circuitBreaker{
state: breakerClosed,
retryInterval: retryInterval,
maxDelay: maxDelay,
openThreshold: openThreshold,
halfOpenWindow: halfOpenWindow,
stateSince: now,
lastTransition: now,
}
}
func (b *circuitBreaker) allow(now time.Time) bool {
@ -58,6 +63,8 @@ func (b *circuitBreaker) allow(now time.Time) bool {
if now.Sub(b.openedAt) >= b.retryInterval {
b.state = breakerHalfOpen
b.lastAttempt = now
b.stateSince = now
b.lastTransition = now
return true
}
return false
@ -76,8 +83,11 @@ func (b *circuitBreaker) recordSuccess() {
b.mu.Lock()
defer b.mu.Unlock()
if b.state != breakerClosed {
now := time.Now()
b.state = breakerClosed
b.failureCount = 0
b.stateSince = now
b.lastTransition = now
}
}
@ -105,6 +115,8 @@ func (b *circuitBreaker) trip(now time.Time) {
}
b.retryInterval = delay
b.openedAt = now
b.stateSince = now
b.lastTransition = now
}
// BreakerSnapshot represents the current state of a circuit breaker.
@ -118,6 +130,11 @@ type BreakerSnapshot struct {
// State returns a snapshot of the circuit breaker state for API exposure.
func (b *circuitBreaker) State() (state string, failures int, retryAt time.Time) {
state, failures, retryAt, _, _ = b.stateDetails()
return
}
func (b *circuitBreaker) stateDetails() (state string, failures int, retryAt time.Time, since time.Time, lastTransition time.Time) {
b.mu.Lock()
defer b.mu.Unlock()
@ -134,6 +151,5 @@ func (b *circuitBreaker) State() (state string, failures int, retryAt time.Time)
state = "unknown"
}
failures = b.failureCount
return
return state, b.failureCount, retryAt, b.stateSince, b.lastTransition
}

404
internal/monitoring/monitor.go
View file

@ -301,6 +301,85 @@ func (r *realExecutor) Execute(ctx context.Context, task PollTask) {
}
}
type instanceInfo struct {
Key string
Type InstanceType
DisplayName string
Connection string
Metadata map[string]string
}
type pollStatus struct {
LastSuccess time.Time
LastErrorAt time.Time
LastErrorMessage string
LastErrorCategory string
ConsecutiveFailures int
FirstFailureAt time.Time
}
type dlqInsight struct {
Reason string
FirstAttempt time.Time
LastAttempt time.Time
RetryCount int
NextRetry time.Time
}
type ErrorDetail struct {
At time.Time `json:"at"`
Message string `json:"message"`
Category string `json:"category"`
}
type InstancePollStatus struct {
LastSuccess *time.Time `json:"lastSuccess,omitempty"`
LastError *ErrorDetail `json:"lastError,omitempty"`
ConsecutiveFailures int `json:"consecutiveFailures"`
FirstFailureAt *time.Time `json:"firstFailureAt,omitempty"`
}
type InstanceBreaker struct {
State string `json:"state"`
Since *time.Time `json:"since,omitempty"`
LastTransition *time.Time `json:"lastTransition,omitempty"`
RetryAt *time.Time `json:"retryAt,omitempty"`
FailureCount int `json:"failureCount"`
}
type InstanceDLQ struct {
Present bool `json:"present"`
Reason string `json:"reason,omitempty"`
FirstAttempt *time.Time `json:"firstAttempt,omitempty"`
LastAttempt *time.Time `json:"lastAttempt,omitempty"`
RetryCount int `json:"retryCount,omitempty"`
NextRetry *time.Time `json:"nextRetry,omitempty"`
}
type InstanceHealth struct {
Key string `json:"key"`
Type string `json:"type"`
DisplayName string `json:"displayName"`
Instance string `json:"instance"`
Connection string `json:"connection"`
PollStatus InstancePollStatus `json:"pollStatus"`
Breaker InstanceBreaker `json:"breaker"`
DeadLetter InstanceDLQ `json:"deadLetter"`
}
func schedulerKey(instanceType InstanceType, name string) string {
return string(instanceType) + "::" + name
}
func timePtr(t time.Time) *time.Time {
if t.IsZero() {
return nil
}
copy := t
return &copy
}
// Monitor handles all monitoring operations
type Monitor struct {
config *config.Config
@ -354,6 +433,9 @@ type Monitor struct {
breakerBaseRetry time.Duration
breakerMaxDelay time.Duration
breakerHalfOpenWindow time.Duration
instanceInfoCache map[string]*instanceInfo
pollStatusMap map[string]*pollStatus
dlqInsightMap map[string]*dlqInsight
}
type rrdMemCacheEntry struct {
@ -1455,6 +1537,9 @@ lastOutcome := make(map[string]taskOutcome)
dockerCommands: make(map[string]*dockerHostCommand),
dockerCommandIndex: make(map[string]string),
guestMetadataCache: make(map[string]guestMetadataCacheEntry),
instanceInfoCache: make(map[string]*instanceInfo),
pollStatusMap: make(map[string]*pollStatus),
dlqInsightMap: make(map[string]*dlqInsight),
}
m.breakerBaseRetry = 5 * time.Second
@ -1468,6 +1553,7 @@ lastOutcome := make(map[string]taskOutcome)
}
m.executor = newRealExecutor(m)
m.buildInstanceInfoCache(cfg)
if m.pollMetrics != nil {
m.pollMetrics.ResetQueueDepth(0)
@ -1726,6 +1812,82 @@ func (m *Monitor) SetExecutor(exec PollExecutor) {
m.executor = exec
}
func (m *Monitor) buildInstanceInfoCache(cfg *config.Config) {
if m == nil || cfg == nil {
return
}
m.mu.Lock()
defer m.mu.Unlock()
if m.instanceInfoCache == nil {
m.instanceInfoCache = make(map[string]*instanceInfo)
}
add := func(instType InstanceType, name string, displayName string, connection string, metadata map[string]string) {
key := schedulerKey(instType, name)
m.instanceInfoCache[key] = &instanceInfo{
Key: key,
Type: instType,
DisplayName: displayName,
Connection: connection,
Metadata: metadata,
}
}
// PVE instances
for _, inst := range cfg.PVEInstances {
name := strings.TrimSpace(inst.Name)
if name == "" {
name = strings.TrimSpace(inst.Host)
}
if name == "" {
name = "pve-instance"
}
display := name
if display == "" {
display = strings.TrimSpace(inst.Host)
}
connection := strings.TrimSpace(inst.Host)
add(InstanceTypePVE, name, display, connection, nil)
}
// PBS instances
for _, inst := range cfg.PBSInstances {
name := strings.TrimSpace(inst.Name)
if name == "" {
name = strings.TrimSpace(inst.Host)
}
if name == "" {
name = "pbs-instance"
}
display := name
if display == "" {
display = strings.TrimSpace(inst.Host)
}
connection := strings.TrimSpace(inst.Host)
add(InstanceTypePBS, name, display, connection, nil)
}
// PMG instances
for _, inst := range cfg.PMGInstances {
name := strings.TrimSpace(inst.Name)
if name == "" {
name = strings.TrimSpace(inst.Host)
}
if name == "" {
name = "pmg-instance"
}
display := name
if display == "" {
display = strings.TrimSpace(inst.Host)
}
connection := strings.TrimSpace(inst.Host)
add(InstanceTypePMG, name, display, connection, nil)
}
}
func (m *Monitor) getExecutor() PollExecutor {
m.mu.RLock()
exec := m.executor
@ -2401,6 +2563,39 @@ func (m *Monitor) sendToDeadLetter(task ScheduledTask, err error) {
next.Interval = 30 * time.Minute
next.NextRun = time.Now().Add(next.Interval)
m.deadLetterQueue.Upsert(next)
key := schedulerKey(task.InstanceType, task.InstanceName)
now := time.Now()
m.mu.Lock()
if m.dlqInsightMap == nil {
m.dlqInsightMap = make(map[string]*dlqInsight)
}
info, ok := m.dlqInsightMap[key]
if !ok {
info = &dlqInsight{}
m.dlqInsightMap[key] = info
}
if info.FirstAttempt.IsZero() {
info.FirstAttempt = now
}
info.LastAttempt = now
info.RetryCount++
info.NextRetry = next.NextRun
if err != nil {
info.Reason = classifyDLQReason(err)
}
m.mu.Unlock()
}
func classifyDLQReason(err error) string {
if err == nil {
return ""
}
if errors.IsRetryableError(err) {
return "max_retry_attempts"
}
return "permanent_failure"
}
func (m *Monitor) randomFloat() float64 {
@ -2464,6 +2659,12 @@ func (m *Monitor) recordTaskResult(instanceType InstanceType, instance string, p
breaker := m.ensureBreaker(key)
m.mu.Lock()
status, ok := m.pollStatusMap[key]
if !ok {
status = &pollStatus{}
m.pollStatusMap[key] = status
}
if pollErr == nil {
if m.failureCounts != nil {
m.failureCounts[key] = 0
@ -2476,6 +2677,9 @@ func (m *Monitor) recordTaskResult(instanceType InstanceType, instance string, p
recordedAt: now,
}
}
status.LastSuccess = now
status.ConsecutiveFailures = 0
status.FirstFailureAt = time.Time{}
m.mu.Unlock()
if breaker != nil {
breaker.recordSuccess()
@ -2484,6 +2688,10 @@ func (m *Monitor) recordTaskResult(instanceType InstanceType, instance string, p
}
transient := isTransientError(pollErr)
category := "permanent"
if transient {
category = "transient"
}
if m.failureCounts != nil {
m.failureCounts[key] = m.failureCounts[key] + 1
}
@ -2495,6 +2703,13 @@ func (m *Monitor) recordTaskResult(instanceType InstanceType, instance string, p
recordedAt: now,
}
}
status.LastErrorAt = now
status.LastErrorMessage = pollErr.Error()
status.LastErrorCategory = category
status.ConsecutiveFailures++
if status.ConsecutiveFailures == 1 {
status.FirstFailureAt = now
}
m.mu.Unlock()
if breaker != nil {
breaker.recordFailure(now)
@ -2509,6 +2724,7 @@ type SchedulerHealthResponse struct {
DeadLetter DeadLetterSnapshot `json:"deadLetter"`
Breakers []BreakerSnapshot `json:"breakers,omitempty"`
Staleness []StalenessSnapshot `json:"staleness,omitempty"`
Instances []InstanceHealth `json:"instances"`
}
// DeadLetterSnapshot contains dead-letter queue data.
@ -2579,6 +2795,194 @@ func (m *Monitor) SchedulerHealth() SchedulerHealthResponse {
response.Staleness = m.stalenessTracker.Snapshot()
}
instanceInfos := make(map[string]*instanceInfo)
pollStatuses := make(map[string]pollStatus)
dlqInsights := make(map[string]dlqInsight)
breakerRefs := make(map[string]*circuitBreaker)
m.mu.RLock()
for k, v := range m.instanceInfoCache {
if v == nil {
continue
}
copyVal := *v
instanceInfos[k] = &copyVal
}
for k, v := range m.pollStatusMap {
if v == nil {
continue
}
pollStatuses[k] = *v
}
for k, v := range m.dlqInsightMap {
if v == nil {
continue
}
dlqInsights[k] = *v
}
for k, v := range m.circuitBreakers {
if v != nil {
breakerRefs[k] = v
}
}
m.mu.RUnlock()
keySet := make(map[string]struct{})
for k := range instanceInfos {
if k != "" {
keySet[k] = struct{}{}
}
}
for k := range pollStatuses {
if k != "" {
keySet[k] = struct{}{}
}
}
for k := range dlqInsights {
if k != "" {
keySet[k] = struct{}{}
}
}
for k := range breakerRefs {
if k != "" {
keySet[k] = struct{}{}
}
}
for _, task := range response.DeadLetter.Tasks {
if task.Instance == "" {
continue
}
keySet[schedulerKey(InstanceType(task.Type), task.Instance)] = struct{}{}
}
for _, snap := range response.Staleness {
if snap.Instance == "" {
continue
}
keySet[schedulerKey(InstanceType(snap.Type), snap.Instance)] = struct{}{}
}
if len(keySet) > 0 {
keys := make([]string, 0, len(keySet))
for k := range keySet {
keys = append(keys, k)
}
sort.Strings(keys)
instances := make([]InstanceHealth, 0, len(keys))
for _, key := range keys {
instType := "unknown"
instName := key
if parts := strings.SplitN(key, "::", 2); len(parts) == 2 {
if parts[0] != "" {
instType = parts[0]
}
if parts[1] != "" {
instName = parts[1]
}
}
instType = strings.TrimSpace(instType)
instName = strings.TrimSpace(instName)
info := instanceInfos[key]
display := instName
connection := ""
if info != nil {
if instType == "unknown" || instType == "" {
if info.Type != "" {
instType = string(info.Type)
}
}
if strings.Contains(info.Key, "::") {
if parts := strings.SplitN(info.Key, "::", 2); len(parts) == 2 {
if instName == key {
instName = parts[1]
}
if (instType == "" || instType == "unknown") && parts[0] != "" {
instType = parts[0]
}
}
}
if info.DisplayName != "" {
display = info.DisplayName
}
if info.Connection != "" {
connection = info.Connection
}
}
display = strings.TrimSpace(display)
connection = strings.TrimSpace(connection)
if display == "" {
display = instName
}
if display == "" {
display = connection
}
if instType == "" {
instType = "unknown"
}
if instName == "" {
instName = key
}
status, hasStatus := pollStatuses[key]
instanceStatus := InstancePollStatus{}
if hasStatus {
instanceStatus.ConsecutiveFailures = status.ConsecutiveFailures
instanceStatus.LastSuccess = timePtr(status.LastSuccess)
if !status.FirstFailureAt.IsZero() {
instanceStatus.FirstFailureAt = timePtr(status.FirstFailureAt)
}
if !status.LastErrorAt.IsZero() && status.LastErrorMessage != "" {
instanceStatus.LastError = &ErrorDetail{
At: status.LastErrorAt,
Message: status.LastErrorMessage,
Category: status.LastErrorCategory,
}
}
}
breakerInfo := InstanceBreaker{
State: "closed",
FailureCount: 0,
}
if br, ok := breakerRefs[key]; ok && br != nil {
state, failures, retryAt, since, lastTransition := br.stateDetails()
if state != "" {
breakerInfo.State = state
}
breakerInfo.FailureCount = failures
breakerInfo.RetryAt = timePtr(retryAt)
breakerInfo.Since = timePtr(since)
breakerInfo.LastTransition = timePtr(lastTransition)
}
dlqInfo := InstanceDLQ{Present: false}
if dlq, ok := dlqInsights[key]; ok {
dlqInfo.Present = true
dlqInfo.Reason = dlq.Reason
dlqInfo.FirstAttempt = timePtr(dlq.FirstAttempt)
dlqInfo.LastAttempt = timePtr(dlq.LastAttempt)
dlqInfo.RetryCount = dlq.RetryCount
dlqInfo.NextRetry = timePtr(dlq.NextRetry)
}
instances = append(instances, InstanceHealth{
Key: key,
Type: instType,
DisplayName: display,
Instance: instName,
Connection: connection,
PollStatus: instanceStatus,
Breaker: breakerInfo,
DeadLetter: dlqInfo,
})
}
response.Instances = instances
} else {
response.Instances = []InstanceHealth{}
}
return response
}

83
internal/monitoring/monitor_health_test.go Normal file
View file

@ -0,0 +1,83 @@
package monitoring
import (
"testing"
"time"
"github.com/rcourtman/pulse-go-rewrite/internal/config"
)
func TestSchedulerHealth_EnhancedResponse(t *testing.T) {
cfg := &config.Config{
AdaptivePollingEnabled: true,
AdaptivePollingBaseInterval: 2 * time.Second,
PVEInstances: []config.PVEInstance{
{Name: "pve-a", Host: "https://pve-a:8006"},
},
PBSInstances: []config.PBSInstance{
{Name: "pbs-b", Host: "https://pbs-b:8007"},
},
}
cfg.EnableBackupPolling = false
monitor, err := New(cfg)
if err != nil {
t.Fatalf("unexpected error creating monitor: %v", err)
}
instanceKey := schedulerKey(InstanceTypePVE, "pve-a")
monitor.pollStatusMap[instanceKey] = &pollStatus{
LastSuccess: time.Now().Add(-30 * time.Second),
LastErrorAt: time.Now().Add(-10 * time.Second),
LastErrorMessage: "connection timeout",
LastErrorCategory: "transient",
ConsecutiveFailures: 2,
FirstFailureAt: time.Now().Add(-20 * time.Second),
}
breaker := monitor.ensureBreaker(instanceKey)
breaker.recordFailure(time.Now())
monitor.dlqInsightMap[instanceKey] = &dlqInsight{
Reason: "max_retry_attempts",
FirstAttempt: time.Now().Add(-5 * time.Minute),
LastAttempt: time.Now().Add(-1 * time.Minute),
RetryCount: 5,
NextRetry: time.Now().Add(4 * time.Minute),
}
response := monitor.SchedulerHealth()
if len(response.Instances) == 0 {
t.Fatalf("expected instances to be populated")
}
found := false
for _, inst := range response.Instances {
if inst.Key == instanceKey {
found = true
if inst.DisplayName == "" {
t.Fatalf("expected display name to be set")
}
if inst.Connection == "" {
t.Fatalf("expected connection to be set")
}
if inst.PollStatus.ConsecutiveFailures != 2 {
t.Fatalf("expected consecutive failures to be 2")
}
if inst.PollStatus.LastError == nil || inst.PollStatus.LastError.Message == "" {
t.Fatalf("expected last error details")
}
if inst.Breaker.State == "" {
t.Fatalf("expected breaker state")
}
if !inst.DeadLetter.Present || inst.DeadLetter.RetryCount != 5 {
t.Fatalf("expected dead letter details to be present")
}
}
}
if !found {
t.Fatalf("did not find instance %s in response", instanceKey)
}
}

4
internal/monitoring/scheduler.go
View file

@ -269,10 +269,6 @@ func (s *AdaptiveScheduler) LastScheduled(instanceType InstanceType, instanceNam
return task, ok
}
func schedulerKey(instanceType InstanceType, name string) string {
return string(instanceType) + "::" + name
}
type noopStalenessSource struct{}
func (noopStalenessSource) StalenessScore(instanceType InstanceType, instanceName string) (float64, bool) {