forked from hashicorp/nomad
/
task_runner.go
652 lines (562 loc) · 20.5 KB
/
task_runner.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
package client
import (
"crypto/md5"
"encoding/hex"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"sync"
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/nomad/client/config"
"github.com/hashicorp/nomad/client/driver"
"github.com/hashicorp/nomad/client/getter"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/client/driver/env"
dstructs "github.com/hashicorp/nomad/client/driver/structs"
cstructs "github.com/hashicorp/nomad/client/structs"
)
const (
// killBackoffBaseline is the baseline time for exponential backoff while
// killing a task.
killBackoffBaseline = 5 * time.Second
// killBackoffLimit is the the limit of the exponential backoff for killing
// the task.
killBackoffLimit = 2 * time.Minute
// killFailureLimit is how many times we will attempt to kill a task before
// giving up and potentially leaking resources.
killFailureLimit = 5
)
// TaskRunner is used to wrap a task within an allocation and provide the execution context.
type TaskRunner struct {
config *config.Config
updater TaskStateUpdater
logger *log.Logger
ctx *driver.ExecContext
alloc *structs.Allocation
restartTracker *RestartTracker
// running marks whether the task is running
running bool
runningLock sync.Mutex
resourceUsage *cstructs.TaskResourceUsage
resourceUsageLock sync.RWMutex
task *structs.Task
taskEnv *env.TaskEnvironment
updateCh chan *structs.Allocation
handle driver.DriverHandle
handleLock sync.Mutex
// artifactsDownloaded tracks whether the tasks artifacts have been
// downloaded
artifactsDownloaded bool
destroy bool
destroyCh chan struct{}
destroyLock sync.Mutex
waitCh chan struct{}
}
// taskRunnerState is used to snapshot the state of the task runner
type taskRunnerState struct {
Version string
Task *structs.Task
HandleID string
ArtifactDownloaded bool
}
// TaskStateUpdater is used to signal that tasks state has changed.
type TaskStateUpdater func(taskName, state string, event *structs.TaskEvent)
// NewTaskRunner is used to create a new task context
func NewTaskRunner(logger *log.Logger, config *config.Config,
updater TaskStateUpdater, ctx *driver.ExecContext,
alloc *structs.Allocation, task *structs.Task) *TaskRunner {
// Merge in the task resources
task.Resources = alloc.TaskResources[task.Name]
// Build the restart tracker.
tg := alloc.Job.LookupTaskGroup(alloc.TaskGroup)
if tg == nil {
logger.Printf("[ERR] client: alloc '%s' for missing task group '%s'", alloc.ID, alloc.TaskGroup)
return nil
}
restartTracker := newRestartTracker(tg.RestartPolicy, alloc.Job.Type)
tc := &TaskRunner{
config: config,
updater: updater,
logger: logger,
restartTracker: restartTracker,
ctx: ctx,
alloc: alloc,
task: task,
updateCh: make(chan *structs.Allocation, 64),
destroyCh: make(chan struct{}),
waitCh: make(chan struct{}),
}
return tc
}
// MarkReceived marks the task as received.
func (r *TaskRunner) MarkReceived() {
r.updater(r.task.Name, structs.TaskStatePending, structs.NewTaskEvent(structs.TaskReceived))
}
// WaitCh returns a channel to wait for termination
func (r *TaskRunner) WaitCh() <-chan struct{} {
return r.waitCh
}
// stateFilePath returns the path to our state file
func (r *TaskRunner) stateFilePath() string {
// Get the MD5 of the task name
hashVal := md5.Sum([]byte(r.task.Name))
hashHex := hex.EncodeToString(hashVal[:])
dirName := fmt.Sprintf("task-%s", hashHex)
// Generate the path
path := filepath.Join(r.config.StateDir, "alloc", r.alloc.ID,
dirName, "state.json")
return path
}
// RestoreState is used to restore our state
func (r *TaskRunner) RestoreState() error {
// Load the snapshot
var snap taskRunnerState
if err := restoreState(r.stateFilePath(), &snap); err != nil {
return err
}
// Restore fields
if snap.Task == nil {
err := fmt.Errorf("task runner snapshot include nil Task")
r.logger.Printf("[ERR] client: %v", err)
return err
} else {
r.task = snap.Task
}
r.artifactsDownloaded = snap.ArtifactDownloaded
if err := r.setTaskEnv(); err != nil {
err := fmt.Errorf("failed to create task environment for task %q in allocation %q: %v",
r.task.Name, r.alloc.ID, err)
r.logger.Printf("[ERR] client: %s", err)
return err
}
// Restore the driver
if snap.HandleID != "" {
driver, err := r.createDriver()
if err != nil {
return err
}
handle, err := driver.Open(r.ctx, snap.HandleID)
// In the case it fails, we relaunch the task in the Run() method.
if err != nil {
r.logger.Printf("[ERR] client: failed to open handle to task '%s' for alloc '%s': %v",
r.task.Name, r.alloc.ID, err)
return nil
}
r.handleLock.Lock()
r.handle = handle
r.handleLock.Unlock()
r.runningLock.Lock()
r.running = true
r.runningLock.Unlock()
}
return nil
}
// SaveState is used to snapshot our state
func (r *TaskRunner) SaveState() error {
snap := taskRunnerState{
Task: r.task,
Version: r.config.Version,
ArtifactDownloaded: r.artifactsDownloaded,
}
r.handleLock.Lock()
if r.handle != nil {
snap.HandleID = r.handle.ID()
}
r.handleLock.Unlock()
return persistState(r.stateFilePath(), &snap)
}
// DestroyState is used to cleanup after ourselves
func (r *TaskRunner) DestroyState() error {
return os.RemoveAll(r.stateFilePath())
}
// setState is used to update the state of the task runner
func (r *TaskRunner) setState(state string, event *structs.TaskEvent) {
// Persist our state to disk.
if err := r.SaveState(); err != nil {
r.logger.Printf("[ERR] client: failed to save state of Task Runner: %v", r.task.Name)
}
// Indicate the task has been updated.
r.updater(r.task.Name, state, event)
}
// setTaskEnv sets the task environment. It returns an error if it could not be
// created.
func (r *TaskRunner) setTaskEnv() error {
taskEnv, err := driver.GetTaskEnv(r.ctx.AllocDir, r.config.Node, r.task.Copy(), r.alloc)
if err != nil {
return err
}
r.taskEnv = taskEnv
return nil
}
// createDriver makes a driver for the task
func (r *TaskRunner) createDriver() (driver.Driver, error) {
if r.taskEnv == nil {
err := fmt.Errorf("task environment not made for task %q in allocation %q", r.task.Name, r.alloc.ID)
return nil, err
}
driverCtx := driver.NewDriverContext(r.task.Name, r.config, r.config.Node, r.logger, r.taskEnv)
driver, err := driver.NewDriver(r.task.Driver, driverCtx)
if err != nil {
err = fmt.Errorf("failed to create driver '%s' for alloc %s: %v",
r.task.Driver, r.alloc.ID, err)
r.logger.Printf("[ERR] client: %s", err)
return nil, err
}
return driver, err
}
// Run is a long running routine used to manage the task
func (r *TaskRunner) Run() {
defer close(r.waitCh)
r.logger.Printf("[DEBUG] client: starting task context for '%s' (alloc '%s')",
r.task.Name, r.alloc.ID)
if err := r.validateTask(); err != nil {
r.setState(
structs.TaskStateDead,
structs.NewTaskEvent(structs.TaskFailedValidation).SetValidationError(err))
return
}
if err := r.setTaskEnv(); err != nil {
r.setState(
structs.TaskStateDead,
structs.NewTaskEvent(structs.TaskDriverFailure).SetDriverError(err))
return
}
r.run()
return
}
// validateTask validates the fields of the task and returns an error if the
// task is invalid.
func (r *TaskRunner) validateTask() error {
var mErr multierror.Error
// Validate the user.
unallowedUsers := r.config.ReadStringListToMapDefault("user.blacklist", config.DefaultUserBlacklist)
checkDrivers := r.config.ReadStringListToMapDefault("user.checked_drivers", config.DefaultUserCheckedDrivers)
if _, driverMatch := checkDrivers[r.task.Driver]; driverMatch {
if _, unallowed := unallowedUsers[r.task.User]; unallowed {
mErr.Errors = append(mErr.Errors, fmt.Errorf("running as user %q is disallowed", r.task.User))
}
}
// Validate the artifacts
for i, artifact := range r.task.Artifacts {
// Verify the artifact doesn't escape the task directory.
if err := artifact.Validate(); err != nil {
// If this error occurs there is potentially a server bug or
// mallicious, server spoofing.
r.logger.Printf("[ERR] client: allocation %q, task %v, artifact %#v (%v) fails validation: %v",
r.alloc.ID, r.task.Name, artifact, i, err)
mErr.Errors = append(mErr.Errors, fmt.Errorf("artifact (%d) failed validation: %v", i, err))
}
}
if len(mErr.Errors) == 1 {
return mErr.Errors[0]
}
return mErr.ErrorOrNil()
}
func (r *TaskRunner) run() {
// Predeclare things so we an jump to the RESTART
var handleEmpty bool
var stopCollection chan struct{}
for {
// Download the task's artifacts
if !r.artifactsDownloaded && len(r.task.Artifacts) > 0 {
r.setState(structs.TaskStatePending, structs.NewTaskEvent(structs.TaskDownloadingArtifacts))
taskDir, ok := r.ctx.AllocDir.TaskDirs[r.task.Name]
if !ok {
err := fmt.Errorf("task directory couldn't be found")
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskDriverFailure).SetDriverError(err))
r.logger.Printf("[ERR] client: task directory for alloc %q task %q couldn't be found", r.alloc.ID, r.task.Name)
r.restartTracker.SetStartError(err)
goto RESTART
}
for _, artifact := range r.task.Artifacts {
if err := getter.GetArtifact(r.taskEnv, artifact, taskDir, r.logger); err != nil {
r.setState(structs.TaskStateDead,
structs.NewTaskEvent(structs.TaskArtifactDownloadFailed).SetDownloadError(err))
r.restartTracker.SetStartError(dstructs.NewRecoverableError(err, true))
goto RESTART
}
}
r.artifactsDownloaded = true
}
// Start the task if not yet started or it is being forced. This logic
// is necessary because in the case of a restore the handle already
// exists.
r.handleLock.Lock()
handleEmpty = r.handle == nil
r.handleLock.Unlock()
if handleEmpty {
startErr := r.startTask()
r.restartTracker.SetStartError(startErr)
if startErr != nil {
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskDriverFailure).SetDriverError(startErr))
goto RESTART
}
// Mark the task as started
r.setState(structs.TaskStateRunning, structs.NewTaskEvent(structs.TaskStarted))
r.runningLock.Lock()
r.running = true
r.runningLock.Unlock()
}
if stopCollection == nil {
stopCollection = make(chan struct{})
go r.collectResourceUsageStats(stopCollection)
}
// Wait for updates
WAIT:
for {
select {
case waitRes := <-r.handle.WaitCh():
if waitRes == nil {
panic("nil wait")
}
r.runningLock.Lock()
r.running = false
r.runningLock.Unlock()
// Stop collection of the task's resource usage
close(stopCollection)
// Log whether the task was successful or not.
r.restartTracker.SetWaitResult(waitRes)
r.setState(structs.TaskStateDead, r.waitErrorToEvent(waitRes))
if !waitRes.Successful() {
r.logger.Printf("[INFO] client: task %q for alloc %q failed: %v", r.task.Name, r.alloc.ID, waitRes)
} else {
r.logger.Printf("[INFO] client: task %q for alloc %q completed successfully", r.task.Name, r.alloc.ID)
}
break WAIT
case update := <-r.updateCh:
if err := r.handleUpdate(update); err != nil {
r.logger.Printf("[ERR] client: update to task %q failed: %v", r.task.Name, err)
}
case <-r.destroyCh:
// Kill the task using an exponential backoff in-case of failures.
destroySuccess, err := r.handleDestroy()
if !destroySuccess {
// We couldn't successfully destroy the resource created.
r.logger.Printf("[ERR] client: failed to kill task %q. Resources may have been leaked: %v", r.task.Name, err)
}
// Stop collection of the task's resource usage
close(stopCollection)
// Store that the task has been destroyed and any associated error.
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskKilled).SetKillError(err))
return
}
}
RESTART:
state, when := r.restartTracker.GetState()
r.restartTracker.SetStartError(nil).SetWaitResult(nil)
reason := r.restartTracker.GetReason()
switch state {
case structs.TaskNotRestarting, structs.TaskTerminated:
r.logger.Printf("[INFO] client: Not restarting task: %v for alloc: %v ", r.task.Name, r.alloc.ID)
if state == structs.TaskNotRestarting {
r.setState(structs.TaskStateDead,
structs.NewTaskEvent(structs.TaskNotRestarting).
SetRestartReason(reason))
}
return
case structs.TaskRestarting:
r.logger.Printf("[INFO] client: Restarting task %q for alloc %q in %v", r.task.Name, r.alloc.ID, when)
r.setState(structs.TaskStatePending,
structs.NewTaskEvent(structs.TaskRestarting).
SetRestartDelay(when).
SetRestartReason(reason))
default:
r.logger.Printf("[ERR] client: restart tracker returned unknown state: %q", state)
return
}
// Sleep but watch for destroy events.
select {
case <-time.After(when):
case <-r.destroyCh:
}
// Destroyed while we were waiting to restart, so abort.
r.destroyLock.Lock()
destroyed := r.destroy
r.destroyLock.Unlock()
if destroyed {
r.logger.Printf("[DEBUG] client: Not restarting task: %v because it's destroyed by user", r.task.Name)
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskKilled))
return
}
// Clear the handle so a new driver will be created.
r.handleLock.Lock()
r.handle = nil
stopCollection = nil
r.handleLock.Unlock()
}
}
// startTask creates the driver and start the task.
func (r *TaskRunner) startTask() error {
// Create a driver
driver, err := r.createDriver()
if err != nil {
r.logger.Printf("[ERR] client: failed to create driver of task '%s' for alloc '%s': %v",
r.task.Name, r.alloc.ID, err)
return err
}
// Start the job
handle, err := driver.Start(r.ctx, r.task)
if err != nil {
r.logger.Printf("[ERR] client: failed to start task '%s' for alloc '%s': %v",
r.task.Name, r.alloc.ID, err)
return err
}
r.handleLock.Lock()
r.handle = handle
r.handleLock.Unlock()
return nil
}
// collectResourceUsageStats starts collecting resource usage stats of a Task.
// Collection ends when the passed channel is closed
func (r *TaskRunner) collectResourceUsageStats(stopCollection <-chan struct{}) {
// start collecting the stats right away and then start collecting every
// collection interval
next := time.NewTimer(0)
defer next.Stop()
for {
select {
case <-next.C:
ru, err := r.handle.Stats()
next.Reset(r.config.StatsCollectionInterval)
if err != nil {
// We do not log when the plugin is shutdown as this is simply a
// race between the stopCollection channel being closed and calling
// Stats on the handle.
if !strings.Contains(err.Error(), "connection is shut down") {
r.logger.Printf("[WARN] client: error fetching stats of task %v: %v", r.task.Name, err)
}
continue
}
r.resourceUsageLock.Lock()
r.resourceUsage = ru
r.resourceUsageLock.Unlock()
r.emitStats(ru)
case <-stopCollection:
return
}
}
}
// LatestResourceUsage returns the last resource utilization datapoint collected
func (r *TaskRunner) LatestResourceUsage() *cstructs.TaskResourceUsage {
r.resourceUsageLock.RLock()
defer r.resourceUsageLock.RUnlock()
r.runningLock.Lock()
defer r.runningLock.Unlock()
// If the task is not running there can be no latest resource
if !r.running {
return nil
}
return r.resourceUsage
}
// handleUpdate takes an updated allocation and updates internal state to
// reflect the new config for the task.
func (r *TaskRunner) handleUpdate(update *structs.Allocation) error {
// Extract the task group from the alloc.
tg := update.Job.LookupTaskGroup(update.TaskGroup)
if tg == nil {
return fmt.Errorf("alloc '%s' missing task group '%s'", update.ID, update.TaskGroup)
}
// Extract the task.
var updatedTask *structs.Task
for _, t := range tg.Tasks {
if t.Name == r.task.Name {
updatedTask = t
}
}
if updatedTask == nil {
return fmt.Errorf("task group %q doesn't contain task %q", tg.Name, r.task.Name)
}
// Merge in the task resources
updatedTask.Resources = update.TaskResources[updatedTask.Name]
// Update will update resources and store the new kill timeout.
var mErr multierror.Error
r.handleLock.Lock()
if r.handle != nil {
if err := r.handle.Update(updatedTask); err != nil {
mErr.Errors = append(mErr.Errors, fmt.Errorf("updating task resources failed: %v", err))
}
}
r.handleLock.Unlock()
// Update the restart policy.
if r.restartTracker != nil {
r.restartTracker.SetPolicy(tg.RestartPolicy)
}
// Store the updated alloc.
r.alloc = update
r.task = updatedTask
return mErr.ErrorOrNil()
}
// handleDestroy kills the task handle. In the case that killing fails,
// handleDestroy will retry with an exponential backoff and will give up at a
// given limit. It returns whether the task was destroyed and the error
// associated with the last kill attempt.
func (r *TaskRunner) handleDestroy() (destroyed bool, err error) {
// Cap the number of times we attempt to kill the task.
for i := 0; i < killFailureLimit; i++ {
if err = r.handle.Kill(); err != nil {
// Calculate the new backoff
backoff := (1 << (2 * uint64(i))) * killBackoffBaseline
if backoff > killBackoffLimit {
backoff = killBackoffLimit
}
r.logger.Printf("[ERR] client: failed to kill task '%s' for alloc %q. Retrying in %v: %v",
r.task.Name, r.alloc.ID, backoff, err)
time.Sleep(time.Duration(backoff))
} else {
// Kill was successful
return true, nil
}
}
return
}
// Helper function for converting a WaitResult into a TaskTerminated event.
func (r *TaskRunner) waitErrorToEvent(res *dstructs.WaitResult) *structs.TaskEvent {
return structs.NewTaskEvent(structs.TaskTerminated).
SetExitCode(res.ExitCode).
SetSignal(res.Signal).
SetExitMessage(res.Err)
}
// Update is used to update the task of the context
func (r *TaskRunner) Update(update *structs.Allocation) {
select {
case r.updateCh <- update:
default:
r.logger.Printf("[ERR] client: dropping task update '%s' (alloc '%s')",
r.task.Name, r.alloc.ID)
}
}
// Destroy is used to indicate that the task context should be destroyed
func (r *TaskRunner) Destroy() {
r.destroyLock.Lock()
defer r.destroyLock.Unlock()
if r.destroy {
return
}
r.destroy = true
close(r.destroyCh)
}
// emitStats emits resource usage stats of tasks to remote metrics collector
// sinks
func (r *TaskRunner) emitStats(ru *cstructs.TaskResourceUsage) {
if ru.ResourceUsage.MemoryStats != nil {
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "memory", "rss"}, float32(ru.ResourceUsage.MemoryStats.RSS))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "memory", "cache"}, float32(ru.ResourceUsage.MemoryStats.Cache))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "memory", "swap"}, float32(ru.ResourceUsage.MemoryStats.Swap))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "memory", "max_usage"}, float32(ru.ResourceUsage.MemoryStats.MaxUsage))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "memory", "kernel_usage"}, float32(ru.ResourceUsage.MemoryStats.KernelUsage))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "memory", "kernel_max_usage"}, float32(ru.ResourceUsage.MemoryStats.KernelMaxUsage))
}
if ru.ResourceUsage.CpuStats != nil {
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "cpu", "total_percent"}, float32(ru.ResourceUsage.CpuStats.Percent))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "cpu", "system"}, float32(ru.ResourceUsage.CpuStats.SystemMode))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "cpu", "user"}, float32(ru.ResourceUsage.CpuStats.UserMode))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "cpu", "throttled_time"}, float32(ru.ResourceUsage.CpuStats.ThrottledTime))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "cpu", "throttled_periods"}, float32(ru.ResourceUsage.CpuStats.ThrottledPeriods))
metrics.SetGauge([]string{"client", "allocs", r.alloc.Job.Name, r.alloc.TaskGroup, r.alloc.ID, r.task.Name, "cpu", "total_ticks"}, float32(ru.ResourceUsage.CpuStats.TotalTicks))
}
//TODO Add Pid stats when we add an API to enable/disable them
}