The sampler was expecting an app object with db and users attributes,
but handler settings don't provide that. Changed to pass handler's
self.db and self.find_user directly to the sampler.
Also added flush=True to print statements for immediate log output.
Add ActivitySampler singleton class that automatically samples activity
for ALL users (active, idle, offline) at configurable interval using
Tornado's PeriodicCallback for non-blocking execution.
- Uses JUPYTERHUB_ACTIVITYMON_ACTIVITY_UPDATE_INTERVAL (default 600s)
- Starts via post_init_hook after JupyterHub initialization
- Runs first sample immediately on startup
- Logs tick statistics after each sample cycle
- Fixes: missing parenthesis and stray code from previous edit
Threshold-based coloring (green/yellow/red) doesn't work for
multi-core systems where CPU usage can exceed 100% (e.g., 6400%
on 64-core machines). Now displays plain text values.
- Activity Monitor now shows all users with historical activity, not just active servers
- Badge changed from "X active servers" to "X users (Y active)" format
- Status column now sortable (green > amber > red priority)
- Default sort changed to status descending with secondary sort by username
- Moved inline table styles to CSS classes using em units
- Added .activity-table, .settings-table, .notifications-table classes
- Simplified Activity page subtitle
- Add clickable column sorting for User, CPU, Memory, Time Left, Last Active
- Sorting cycles: descending -> ascending -> none (default)
- Sort icons show current direction
- Last Active now shows full words ("8 minutes ago", "4 months ago")
- Proper singular/plural handling for time units
- ActivityMonitor now uses /data/activity_samples.sqlite instead of
JupyterHub's main database to avoid SQLite locking conflicts
- Fixes "database is locked" errors that prevented login when both
JupyterHub and ActivityMonitor wrote simultaneously
- Added "Last Active" column to activity table showing relative time
- Add ActivitySample SQLAlchemy model for database persistence
- Add ActivityMonitor singleton with scoring, reset, lifecycle methods
- Add JUPYTERHUB_ACTIVITYMON_INACTIVE_AFTER env var (default 60 min)
- Update defaults: SAMPLE_INTERVAL=600s, RETENTION_DAYS=7
- Fix score calculation to use measured samples only (not theoretical max)
- Add 3-state status: green (active), yellow (inactive), red (offline)
- Add recently_active field in API response
- Add Reset button with confirmation dialog
- Fix green color (explicit #28a745 instead of text-success)
- Add ThreadPoolExecutor for non-blocking Docker stats
- Remove old background sampler code (on-demand sampling now)
- Bump version to 3.7.0
- Truncate requested hours to max available instead of returning error
- Add 'truncated' flag in API response with detailed message
- UI shows warning alert (yellow) when truncated, success (green) otherwise
- Warning displays 4 seconds vs 2 seconds for normal success
- Fixed extend button re-enable after successful extension
Session Extension Feature:
- Add JUPYTERHUB_IDLE_CULLER_MAX_EXTENSION env var (default 24h)
- Add SessionInfoHandler and ExtendSessionHandler API endpoints
- Add Session Status card to home page with countdown timer
- Extension tracking in spawner state (resets on server restart)
- Color-coded warnings (yellow <1h, red <30min)
Environment Settings Harmonization:
- Add all ENV defaults to Dockerfile
- Add idle culler settings to compose.yml
- Standardize logo as JUPYTERHUB_LOGO_URI with file:// prefix
- Update NVIDIA_IMAGE to nvidia/cuda:13.0.2-base-ubuntu24.04
HomeHandler doesn't pass server_version to templates (only AdminHandler does).
Added jupyterhub.__version__ to c.JupyterHub.template_vars for global access.
Add ability to send notifications to selected servers instead of all.
- New ActiveServersHandler at GET /api/notifications/active-servers
- BroadcastNotificationHandler accepts optional recipients array
- UI with "Send to all" checkbox and server selection list
- Select All/Deselect All buttons, dynamic button text
- Backward compatible - sends to all if recipients not specified
- Add JUPYTERHUB_LOGO_FILE config for custom logo (served at /hub/logo)
- Fix CustomAuthorizationAreaHandler with @needs_scope decorator
- Import orm inside get() method to fix NameError
- Simplify page.html logo block (always use base_url/logo)
- Fix Add Users button to use stock btn-light colors (size only)
- Disable hover on expanded card tables via box-shadow override
- Add padding:0 to expanded user detail td cells
- Make collapse buttons more compact (0.2rem 0.3rem)
- Add left padding to username labels
- Add groups page styling (list items, card footer)
- Add notifications page styling (form, textarea, results table)
- Unify button font sizes to 0.8rem across all pages
- Set collapsed user card padding to 0
- Add subtle hover effect on admin user rows (0.015 alpha)
- Style Add Users form panel with dark mode support
- Style authorization and token pages consistently
