We are pleased to announce Sentinel 1.1. This release does not introduce new monitor types or change how Sentinel checks your services – instead, it focuses on the experience of working with your monitors day to day. For engineering teams and IT managers alike, managing service reliability at scale means more than just knowing when something goes down. It means being able to organise your monitoring estate, understand SLA trends over time, and surface the right data to the right people quickly. The three features in this release are a direct response to that.
Monitor Grouping
As organisations grow their use of uptime monitoring, a flat, undifferentiated list of services becomes a liability. Finding the monitors that matter – during an incident, in a review, or as part of routine oversight – takes longer than it should. Sentinel 1.1 introduces Monitor Groups to address this.
Monitor Groups give teams a way to organise their HTTP monitors, heartbeat monitors, and DNS monitors into named, hierarchical collections. Groups can reflect whatever structure makes sense for your organisation: environments such as Production and Staging, functional teams, customer-facing services versus internal tooling, or any other grouping that maps to how your team thinks about service reliability.
Groups are hierarchical – a top-level group might represent an entire environment, with child groups beneath it for individual services or teams. They are managed, where permissioned, directly from the Monitor Overview without leaving the page. Creating a group takes a name, an optional description, and a selection of monitors to include. Changes are reflected across the interface immediately, and monitors that have not been assigned to any group remain visible at all times, so nothing is accidentally obscured during a partial rollout.
Overview Filtering
Organising monitors into groups is only useful if the overview reflects that structure. The Monitor Overview in Sentinel 1.1 now exposes your group hierarchy as a navigable filter, sitting alongside the existing monitor type filter. Rather than scrolling through every monitor, you can step into a group and see only the services relevant to that context. Breadcrumb navigation makes it straightforward to move between levels and return to the full view.
Critically, each group card in the filter panel displays a live service health summary – a count of online, offline, and pending monitors – before you navigate into it. For IT managers responsible for service availability across multiple teams or environments, this means you can take in the state of your entire monitor estate at a glance, without drilling into individual monitors. The group filter and monitor type filter work in combination, so teams can narrow by both dimensions simultaneously.
Uptime Charts and SLA Visibility
Understanding service reliability requires more than a single uptime percentage. Trends matter. Knowing that a service was down last Tuesday tells you something; knowing that latency has been creeping up over the past month, and that two availability incidents occurred during that window, tells you considerably more.
Sentinel 1.1 adds a dedicated uptime chart to every HTTP monitor’s detail page. The chart plots uptime percentage over a selectable time window – from the last hour through to the last 365 days – and automatically adjusts its data granularity so the chart remains readable at any scale. Where response latency data is available, it is overlaid as a second dataset on the same chart, allowing teams to identify whether a period of reduced availability coincided with elevated response times. This correlation is often the first step in diagnosing whether a reliability event was caused by infrastructure capacity, a dependency failure, or something else entirely.
For teams tracking SLA compliance, the chart provides a clear view of uptime history across meaningful time periods. The existing 24-hour, 7-day, and 31-day uptime summaries remain on the page for quick reference alongside the chart, giving both a snapshot and a historical view in the same place.
Sentinel 1.1 is available now. If you have any questions or feedback, please reach out through the usual channels.