alerting
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Checkly
Checkly is a developer-first synthetic monitoring and reliability platform that lets engineering teams define uptime, API, and browser checks as version-controlled code. Built on Microsoft's Playwright framework and OpenTelemetry, it runs checks from 20+ global locations and layers in AI-driven root cause analysis. Founded in 2018 and headquartered with roots in Berlin, Checkly serves 1,000+ customers - including Vercel, 1Password, CrowdStrike, and Mistral - and has raised $32.25M, most recently a $20M Series B led by Balderton Capital in 2024.
Grafana Labs
Grafana Labs is the company behind Grafana, the widely used open-source dashboarding and observability platform. Founded in 2014 to commercialize Torkel Odegaard's visualization tool, it has grown into a full-stack observability vendor built on a 'big tent' philosophy - letting teams unify metrics, logs, traces and profiles from any source without ripping out existing tools. Its LGTM stack (Loki, Grafana, Tempo, Mimir) plus Grafana Cloud and Grafana Enterprise now serve more than 7,000 paying organizations, including roughly 70% of the Fortune 50, with the business surpassing $400M in annual recurring revenue and a $6B valuation.
Last9
Last9 is a unified observability company that helps engineering and DevOps teams monitor high-cardinality metrics, logs, and traces without the ballooning costs of legacy tools. Built around a Prometheus- and OpenTelemetry-compatible telemetry warehouse called Levitate and a pre-ingestion Control Plane that filters, reshapes, and routes data, Last9 has been used to observe some of the largest live-streaming events in the world - including peaks of roughly 59-61 million concurrent viewers. Founded in 2020 and backed by Sequoia/Peak XV's Surge, Better Capital and others, it targets cost-efficient, full-fidelity observability at enterprise scale.