Telemetry data is the stream of measurements that instrumented devices, applications, and services continuously emit to a central system so engineers can monitor behavior, diagnose problems, and make informed decisions in real time and over the long term. In this article, we’ll look at what telemetry data means in practice for modern software, networks, and cloud platforms: how it’s produced, what kinds of signals it carries (logs, metrics, traces, and more), and why it has become essential for observability, performance, and security at scale.

Most discussions about OpenTelemetry pipelines focus on getting data from point A to point B. Collect telemetry, maybe convert the format, forward it to a backend. That’s the minimum viable pipeline, and it’s where most tooling stops. But a pipeline that only moves data is a pipe, not a processing layer. The telemetry arriving at your observability platform or SIEM is only as useful as the context it carries. A raw log entry saying "connection from 198.

OpenTelemetry has become the de facto standard for telemetry data. Nearly 50% of surveyed cloud-native end-user companies have adopted it, and the project ranks as the second-highest-velocity initiative in the CNCF, behind only Kubernetes. The direction is clear: if your infrastructure doesn’t speak OpenTelemetry, it will increasingly be left out of the observability conversation. But adopting OpenTelemetry across an entire infrastructure is a different problem than adopting it in a greenfield application.

Choosing between Fluent Bit and Fluentd is an architecture decision, not a product shootout. Both projects live under the CNCF Fluent umbrella and share a common lineage at Treasure Data, but they target different roles in a logging pipeline. Fluent Bit is a C-based telemetry agent designed for low-overhead collection at the edge. Fluentd is a Ruby-and-C data collector built for aggregation, transformation, and multi-destination routing. The practical question is not which one is better — it’s where each one belongs in your stack, and whether you need both.

Why the federal agency breach shows that standardized telemetry formats aren’t optional anymore When CISA analyzed the federal agency breach that went undetected for three weeks, they identified a familiar pattern: EDR alerts existed but weren’t continuously reviewed. Security teams had visibility tools, but critical signals got lost in the noise. What the advisory doesn’t detail—​but every security practitioner knows—​is the infrastructure nightmare hiding behind that simple statement. Those unreviewed alerts likely came from dozens of sources, each speaking its own dialect of security telemetry.

The SentinelOne outage showed why visibility isn’t optional—​even when your defenses keep running. On May 29, 2025, organizations running SentinelOne experienced something unsettling: their security controls kept working, but they couldn’t see what was happening. A software flaw in SentinelOne’s infrastructure control system caused a global service disruption that lasted several hours. According to reports, the incident significantly impacted customers' ability to manage their security operations and access important data.