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Applet-Synchronizer Changelog

Latest Beta Version​

Added​

  • Configuration option allowSlaveBroadcast to allow slave devices to broadcast values to all devices in a group via update_sync_config event.
  • Observability endpoints GET /dashboard (+ /dashboard/view) and GET /metrics (Prometheus, sos_applet_synchronizer_ prefix) surfacing sync counters, barrier fill latency, connected peers/active groups and duplicate-deviceIdentification group collisions. Optional Helm ServiceMonitor (metrics.serviceMonitor.enabled) to scrape it.

Fixed​

  • Evict empty sync groups from memory so the dashboard, metrics and the periodic status tick do not accumulate dead groups.
  • Emit device_status on device disconnect for organization-prefixed groups.
  • Register a joining peer only when deviceIdentification is provided (the guard was always true before).
  • Handle leave_group on the server so client leaveGroup() acks instead of hanging.

Changed​

  • Abort barriers pending over 20s server-side and count them as dropped (env SYNC_BARRIER_TIMEOUT_MS, 0 disables).
  • Cache the organization prefix per device for 60s to avoid a Mongo query on every join_group.

Security​

  • /dashboard(+/view) and /metrics now require a Bearer token (dashboard_token); they respond 404 until it is set.

[2.2.0] - 2025-06-13​

Fixed​

  • Picking master device in the group based on deviceIdentification alphabetical order instead of the device creation date (keep the logic same with client - front-display).

Added​

  • Public build of the Applet Synchronizer service as @signageos/applet-synchronizer-public package in public registry npmjs.com.

[2.1.3] - 2024-11-13​

Fixed​

  • Fixed race condition during startup where some nested process would throw an unhandled error before the global handler is registered.
  • Status event contained group name with the internal organization uid prefix instead of the pure group name without the prefix.

[2.1.2] - 2024-01-18​

Security​

  • CVE-2017-16137

[2.1.1] - 2023-12-20​

Fixed​

  • Formatted repository

[2.1.0] - 2022-03-16​

Added​

  • Sending information about connected devices in group

[2.0.1] - 2020-07-29​

Fixed​

  • Failsafe connection to proprietary database replication

[2.0.0] - 2020-01-12​

Changed​

  • Change database implementation from RethinkDB to MongoDB

[1.0.4] - 2019-07-16​

Fixed​

  • Added missing /status page for healthcheck

[1.0.0] - 2018-07-17​

Added​

  • Changelog file containing all changes in current project

Changed​

  • Obfuscate all development details and publish a clean npm package that's safe to make public for on-premise installations