Sensu Go

Sensu Go is a self-hosted monitoring and observability system built for DevOps and SRE teams managing infrastructure across cloud, containers, and bare metal. It is best suited to organizations that want to automate monitoring configuration and response, rather than simply collect dashboards. The free allowance is useful for smaller estates, but paid node minimums make the move to a subscription a meaningful commitment.

Overview

Sensu gathers monitoring events, filters and transforms them, then sends them to a database chosen by the customer. That gives teams control over the destination and shape of their monitoring data, but also makes operating the system part of the deal. Its declarative configuration can be edited, reviewed, versioned, and shared, bringing monitoring changes into a code-based workflow that suits infrastructure teams with established review practices.

Agents discover and register virtual machines, public-cloud compute instances, containers, and their services. Sensu says a single cluster can monitor tens of thousands of nodes, while federation provides visibility across globally distributed infrastructure. This is substantial headroom for large deployments, though smaller teams may not need the scale or the operational complexity of a self-hosted platform.

Key features

Checks, metrics, and event processing

Sensu supports system and service health checks, custom scripts including Nagios-style plugins, basic system metrics, custom application metrics, and log collection. The combination lets teams bring several monitoring signals into one event pipeline, rather than limiting the system to host availability. Sensu can send the resulting events to a customer-selected database, which is useful when teams want to control their storage destination.

Alerting and remediation

Alerts can go by email, Slack, or SMS; Sensu can also create or resolve incidents in PagerDuty, ServiceNow, and JIRA, and deduplicate alerts. That breadth connects monitoring to both notification channels and incident workflows. For routine response, it can restart services, run custom scripts, or request Ansible jobs through Ansible Tower. These automated actions can reduce repetitive intervention, but teams need to own the scripts and response processes they rely on.

Security and integrations

Security options include LDAP, Active Directory, and OIDC single sign-on, mTLS certificate authentication, external PKI verification, and CRL support. Named integrations and compatible tools include Elasticsearch, Splunk, PagerDuty, ServiceNow, Ansible Tower, Prometheus, and Nagios. Together, these make Sensu a plausible fit for organizations connecting monitoring to an existing operations stack rather than replacing every tool around it.

Pricing

Sensu Go uses a freemium model. Sensu Go FREE costs nothing, with no trial required, and covers 100 nodes at one site. It is the sensible starting point for smaller deployments, but the single-site and node caps limit its usefulness for distributed estates. A free 14-day trial is offered for evaluating Sensu beyond 100 nodes.

Sensu Go Pro costs $36 a year, billed at $36.00 per node per year ($3.00 per node/month, billed annually). It requires a 100-node minimum, covers up to 3,000 nodes at one site, and has a six-hour support response. The minimum makes this a poor fit for organizations that only need a modest expansion beyond the free tier; the per-node model is clearer for teams planning a deployment within its cap.

Sensu Go Enterprise costs $60 a year, billed at $60.00 per node per year ($5.00 per node/month, billed annually). It has a 300-node minimum, allows unlimited sites, and supports unlimited nodes up to the amount purchased, with a three-hour support response. The higher minimum and price are aimed at larger or geographically distributed operations that need multiple sites and faster support response. Both paid tiers are self-hosted and node-priced, so expected node count matters when comparing them.

Platforms

Sensu Go is self-hosted and supports Linux and Windows for monitoring coverage. Its download packages include Windows agent and CLI, macOS agent and CLI, and Linux backend, agent, and CLI; the backend is unsupported on Windows and macOS. Sensu says it runs on AWS, GCP, Azure, Kubernetes, Red Hat OpenShift, Docker, and OpenStack. The platform mix supports varied infrastructure, but macOS is not a backend option.

Who it's for

Sensu Go suits DevOps and SRE teams that want monitoring as code, dynamic infrastructure discovery, event processing, and automated remediation under their own operational control. It is especially compelling when teams need to connect alerts with established incident tools or monitor a large estate across sites. Readers wanting a hosted service, or a paid plan without a substantial node minimum, should look elsewhere.

Pros and cons

Pros: The free tier covers up to 100 nodes, making it possible to start without a paid subscription.

Pros: Discovery, event handling, alert deduplication, and remediation combine monitoring and response in a single self-hosted workflow.

Pros: Monitoring configuration can be versioned and reviewed, which helps teams manage changes as code.

Cons: Pro requires 100 nodes and Enterprise 300, so small teams can face a steep jump from free.

Cons: The customer chooses and operates the event database, adding responsibility beyond configuring checks and alerts.

Cons: Backend support is limited to Linux, despite agent and CLI packages for Windows and macOS.

Alternatives

For other infrastructure monitoring options, see Infrastructure Monitoring and Container Monitoring.

Netdata is worth considering if a small deployment fits its Community plan, which is free for up to five active connected nodes and one active custom dashboard per room.

Checkmk may suit teams seeking a free community edition with 2,000+ pre-built integrations and coverage for up to about 100 hosts.

Icinga is an alternative for readers who want a free, open-source edition with unlimited hosts and services.

Mackerel may fit a small monitored estate: its free plan covers five standard and micro hosts total, with 500 metrics and one day of data retention.

MetricsHub is an alternative built around OpenTelemetry and described as an open-source project.

openITCOCKPIT offers a free Community Edition for infrastructure and application monitoring.

Site24x7 Server Monitoring is another freemium option, with a Lite plan at $9 a month billed annually for two servers and five websites.

Nagios XI has a free plan capped at seven nodes or 100 services, whichever comes first, and is an option for readers who want a Nagios product.

Verdict

Choose Sensu Go if your DevOps or SRE team wants a self-hosted, code-driven monitoring pipeline that can discover infrastructure and automate incident response. Its strongest case is the combination of event processing, integrations, and remediation, with a free 100-node entry point. Look elsewhere if you need hosted monitoring or cannot justify the paid plans' 100- or 300-node minimums.