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docs: add documentation for prebuild scheduling feature#18462

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4 changes: 2 additions & 2 deletionscoderd/prebuilds/preset_snapshot.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -267,14 +267,14 @@ func (p PresetSnapshot) CalculateState() *ReconciliationState {
// - ActionTypeBackoff: Only BackoffUntil is set, indicating when to retry
// - ActionTypeCreate: Only Create is set, indicating how many prebuilds to create
// - ActionTypeDelete: Only DeleteIDs is set, containing IDs of prebuilds to delete
func (p PresetSnapshot) CalculateActions(clock quartz.Clock,backoffInterval time.Duration) ([]*ReconciliationActions, error) {
func (p PresetSnapshot) CalculateActions(backoffInterval time.Duration) ([]*ReconciliationActions, error) {
// TODO: align workspace states with how we represent them on the FE and the CLI
// right now there's some slight differences which can lead to additional prebuilds being created

// TODO: add mechanism to prevent prebuilds being reconciled from being claimable by users; i.e. if a prebuild is
// about to be deleted, it should not be deleted if it has been claimed - beware of TOCTOU races!

actions, needsBackoff := p.needsBackoffPeriod(clock, backoffInterval)
actions, needsBackoff := p.needsBackoffPeriod(p.clock, backoffInterval)
if needsBackoff {
return actions, nil
}
Expand Down
42 changes: 21 additions & 21 deletionscoderd/prebuilds/preset_snapshot_test.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -86,12 +86,12 @@ func TestNoPrebuilds(t *testing.T) {
preset(true, 0, current),
}

snapshot := prebuilds.NewGlobalSnapshot(presets, nil, nil, nil, nil, nil,quartz.NewMock(t), testutil.Logger(t))
snapshot := prebuilds.NewGlobalSnapshot(presets, nil, nil, nil, nil, nil,clock, testutil.Logger(t))
ps, err := snapshot.FilterByPreset(current.presetID)
require.NoError(t, err)

state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)

validateState(t, prebuilds.ReconciliationState{ /*all zero values*/ }, *state)
Expand All@@ -108,12 +108,12 @@ func TestNetNew(t *testing.T) {
preset(true, 1, current),
}

snapshot := prebuilds.NewGlobalSnapshot(presets, nil, nil, nil, nil, nil,quartz.NewMock(t), testutil.Logger(t))
snapshot := prebuilds.NewGlobalSnapshot(presets, nil, nil, nil, nil, nil,clock, testutil.Logger(t))
ps, err := snapshot.FilterByPreset(current.presetID)
require.NoError(t, err)

state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)

validateState(t, prebuilds.ReconciliationState{
Expand DownExpand Up@@ -156,7 +156,7 @@ func TestOutdatedPrebuilds(t *testing.T) {

// THEN: we should identify that this prebuild is outdated and needs to be deleted.
state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{
Actual: 1,
Expand All@@ -174,7 +174,7 @@ func TestOutdatedPrebuilds(t *testing.T) {

// THEN: we should not be blocked from creating a new prebuild while the outdate one deletes.
state = ps.CalculateState()
actions, err = ps.CalculateActions(clock,backoffInterval)
actions, err = ps.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{Desired: 1}, *state)
validateActions(t, []*prebuilds.ReconciliationActions{
Expand DownExpand Up@@ -223,7 +223,7 @@ func TestDeleteOutdatedPrebuilds(t *testing.T) {
// THEN: we should identify that this prebuild is outdated and needs to be deleted.
// Despite the fact that deletion of another outdated prebuild is already in progress.
state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{
Actual: 1,
Expand DownExpand Up@@ -467,7 +467,7 @@ func TestInProgressActions(t *testing.T) {

// THEN: we should identify that this prebuild is in progress.
state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)
tc.checkFn(*state, actions)
})
Expand DownExpand Up@@ -510,7 +510,7 @@ func TestExtraneous(t *testing.T) {

// THEN: an extraneous prebuild is detected and marked for deletion.
state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{
Actual: 2, Desired: 1, Extraneous: 1, Eligible: 2,
Expand DownExpand Up@@ -685,13 +685,13 @@ func TestExpiredPrebuilds(t *testing.T) {
}

// WHEN: calculating the current preset's state.
snapshot := prebuilds.NewGlobalSnapshot(presets, nil, running, nil, nil, nil,quartz.NewMock(t), testutil.Logger(t))
snapshot := prebuilds.NewGlobalSnapshot(presets, nil, running, nil, nil, nil,clock, testutil.Logger(t))
ps, err := snapshot.FilterByPreset(current.presetID)
require.NoError(t, err)

// THEN: we should identify that this prebuild is expired.
state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)
tc.checkFn(running, *state, actions)
})
Expand DownExpand Up@@ -727,7 +727,7 @@ func TestDeprecated(t *testing.T) {

// THEN: all running prebuilds should be deleted because the template is deprecated.
state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{
Actual: 1,
Expand DownExpand Up@@ -774,13 +774,13 @@ func TestLatestBuildFailed(t *testing.T) {
}

// WHEN: calculating the current preset's state.
snapshot := prebuilds.NewGlobalSnapshot(presets, nil, running, inProgress, backoffs, nil,quartz.NewMock(t), testutil.Logger(t))
snapshot := prebuilds.NewGlobalSnapshot(presets, nil, running, inProgress, backoffs, nil,clock, testutil.Logger(t))
psCurrent, err := snapshot.FilterByPreset(current.presetID)
require.NoError(t, err)

// THEN: reconciliation should backoff.
state := psCurrent.CalculateState()
actions, err := psCurrent.CalculateActions(clock,backoffInterval)
actions, err := psCurrent.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{
Actual: 0, Desired: 1,
Expand All@@ -798,7 +798,7 @@ func TestLatestBuildFailed(t *testing.T) {

// THEN: it should NOT be in backoff because all is OK.
state = psOther.CalculateState()
actions, err = psOther.CalculateActions(clock,backoffInterval)
actions, err = psOther.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{
Actual: 1, Desired: 1, Eligible: 1,
Expand All@@ -812,7 +812,7 @@ func TestLatestBuildFailed(t *testing.T) {
psCurrent, err = snapshot.FilterByPreset(current.presetID)
require.NoError(t, err)
state = psCurrent.CalculateState()
actions, err = psCurrent.CalculateActions(clock,backoffInterval)
actions, err = psCurrent.CalculateActions(backoffInterval)
require.NoError(t, err)
validateState(t, prebuilds.ReconciliationState{
Actual: 0, Desired: 1,
Expand DownExpand Up@@ -867,15 +867,15 @@ func TestMultiplePresetsPerTemplateVersion(t *testing.T) {
},
}

snapshot := prebuilds.NewGlobalSnapshot(presets, nil, nil, inProgress, nil, nil,quartz.NewMock(t), testutil.Logger(t))
snapshot := prebuilds.NewGlobalSnapshot(presets, nil, nil, inProgress, nil, nil,clock, testutil.Logger(t))

// Nothing has to be created for preset 1.
{
ps, err := snapshot.FilterByPreset(presetOpts1.presetID)
require.NoError(t, err)

state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)

validateState(t, prebuilds.ReconciliationState{
Expand All@@ -891,7 +891,7 @@ func TestMultiplePresetsPerTemplateVersion(t *testing.T) {
require.NoError(t, err)

state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)

validateState(t, prebuilds.ReconciliationState{
Expand DownExpand Up@@ -995,7 +995,7 @@ func TestPrebuildScheduling(t *testing.T) {
require.NoError(t, err)

state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)

validateState(t, prebuilds.ReconciliationState{
Expand All@@ -1016,7 +1016,7 @@ func TestPrebuildScheduling(t *testing.T) {
require.NoError(t, err)

state := ps.CalculateState()
actions, err := ps.CalculateActions(clock,backoffInterval)
actions, err := ps.CalculateActions(backoffInterval)
require.NoError(t, err)

validateState(t, prebuilds.ReconciliationState{
Expand Down
106 changes: 100 additions & 6 deletionsdocs/admin/templates/extending-templates/prebuilt-workspaces.md
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Original file line numberDiff line numberDiff line change
Expand Up@@ -12,6 +12,7 @@ Prebuilt workspaces are:
- Created and maintained automatically by Coder to match your specified preset configurations.
- Claimed transparently when developers create workspaces.
- Monitored and replaced automatically to maintain your desired pool size.
- Automatically scaled based on time-based schedules to optimize resource usage.

## Relationship to workspace presets

Expand DownExpand Up@@ -111,6 +112,105 @@ prebuilt workspace can remain before it is considered expired and eligible for c
Expired prebuilt workspaces are removed during the reconciliation loop to avoid stale environments and resource waste.
New prebuilt workspaces are only created to maintain the desired count if needed.

### Scheduling and time-based scaling

Prebuilt workspaces support time-based scheduling to scale the number of instances based on usage patterns.
This allows you to reduce resource costs during off-hours while maintaining availability during peak usage times.

Configure scheduling by adding a `scheduling` block within your `prebuilds` configuration:

```hcl
data "coder_workspace_preset" "goland" {
name = "GoLand: Large"
parameters {
jetbrains_ide = "GO"
cpus = 8
memory = 16
}

prebuilds {
instances = 0 # default to 0 instances

scheduling {
timezone = "UTC" # only a single timezone may be used for simplicity
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nit: add the list of supported timezones


# scale to 3 instances during the work week
schedule {
cron = "* 8-18 * * 1-5" # from 8AM-6:59PM, Mon-Fri, UTC
instances = 3 # scale to 3 instances
}

# scale to 1 instance on Saturdays for urgent support queries
schedule {
cron = "* 8-14 * * 6" # from 8AM-2:59PM, Sat, UTC
instances = 1 # scale to 1 instance
}
}
}
}
```

**Scheduling configuration:**

- **`timezone`**: The timezone for all cron expressions (required). Only a single timezone is supported per scheduling configuration.
- **`schedule`**: One or more schedule blocks defining when to scale to specific instance counts.
- **`cron`**: Cron expression interpreted as continuous time ranges (required).
- **`instances`**: Number of prebuilt workspaces to maintain during this schedule (required).

**How scheduling works:**

1. Coder evaluates all active schedules at regular intervals.
2. The schedule that matches the current time becomes active. Overlapping schedules are disallowed by validation rules.
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small nit:

Suggested change
2. The schedulethat matchesthe current timebecomesactive. Overlapping schedules aredisallowed by validation rules.
2. The schedulematchingthe current timeis consideredactive. Overlapping schedules areprevented by validation rules.

3. If no schedules match the current time, the base `instances` count is used.
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small nit:

Suggested change
3. If noschedules match the current time, the base`instances` count is used.
3. If noschedule matches the current time, thesystem defaults to thebase`instances` count.

4. The reconciliation loop automatically creates or destroys prebuilt workspaces to match the target count.

**Cron expression format:**

Cron expressions follow the format: `* HOUR DOM MONTH DAY-OF-WEEK`

- `*` (minute): Must always be `*` to ensure the schedule covers entire hours rather than specific minute intervals
- `HOUR`: 0-23, range (e.g., 8-18 for 8AM-6:59PM), or `*`
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Maybe use the same time interval for consistency:

Suggested change
-`HOUR`:0-23, range (e.g., 8-18 for 8AM-6:59PM), or`*`
-`HOUR`:8-18, range (e.g., 8-18 for 8AM-6:59PM), or`*`

- `DOM` (day-of-month): 1-31, range, or `*`
- `MONTH`: 1-12, range, or `*`
- `DAY-OF-WEEK`: 0-6 (Sunday=0, Saturday=6), range (e.g., 1-5 for Monday to Friday), or `*`

**Important notes about cron expressions:**

- **Minutes must always be `*`**: To ensure the schedule covers entire hours
- **Time ranges are continuous**: A range like `8-18` means from 8AM to 6:59PM (inclusive of both start and end hours)
- **Weekday ranges**: `1-5` means Monday through Friday (Monday=1, Friday=5)
- **No overlapping schedules**: The validation system prevents overlapping schedules.

**Example schedules:**

```hcl
# Business hours only (8AM-6:59PM, Mon-Fri)
schedule {
cron = "* 8-18 * * 1-5"
instances = 5
}

# 24/7 coverage with reduced capacity overnight and on weekends
schedule {
cron = "* 8-18 * * 1-5" # Business hours (8AM-6:59PM, Mon-Fri)
instances = 10
}
schedule {
cron = "* 19-23,0-7 * * 1,5" # Evenings and nights (7PM-11:59PM, 12AM-7:59AM, Mon-Fri)
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Wow, it is possible to compose multiple hour intervals? Nice 🤩

instances = 2
}
schedule {
cron = "* * * * 6,0" # Weekends
instances = 2
}

# Weekend support (10AM-4:59PM, Sat-Sun)
schedule {
cron = "* 10-16 * * 6,0"
instances = 1
}
```

### Template updates and the prebuilt workspace lifecycle

Prebuilt workspaces are not updated after they are provisioned.
Expand DownExpand Up@@ -195,12 +295,6 @@ The prebuilt workspaces feature has these current limitations:

[View issue](https://github.com/coder/internal/issues/364)

- **Autoscaling**

Prebuilt workspaces remain running until claimed. There's no automated mechanism to reduce instances during off-hours.

[View issue](https://github.com/coder/internal/issues/312)

### Monitoring and observability

#### Available metrics
Expand Down
2 changes: 1 addition & 1 deletionenterprise/coderd/prebuilds/reconcile.go
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Expand Up@@ -518,7 +518,7 @@ func (c *StoreReconciler) CalculateActions(ctx context.Context, snapshot prebuil
return nil, ctx.Err()
}

return snapshot.CalculateActions(c.clock, c.cfg.ReconciliationBackoffInterval.Value())
return snapshot.CalculateActions(c.cfg.ReconciliationBackoffInterval.Value())
}

func (c *StoreReconciler) WithReconciliationLock(
Expand Down
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