Top 6 Open-Source Tools in the Kubernetes Monitoring Space

Did you recently transition to a microservice infrastructure? Did you face issues selecting the right Kubernetes monitoring tools while you’re at it? These tools provide you with top-level visibility of your entire data environment. They also help you administer performance and maintenance activities on data structures and facilitate usage report creation. Getting the right one for your unique infrastructure can be critical for operational success!

To benefit from all Kubernetes’ advantages, companies and communities are stepping forward to launch open-source monitoring tools. To help you pick one, we’ve compiled a list of the top 6 open-source Kubernetes monitoring tools. In this article, we’ll discuss each tool’s advantages and pitfalls. You’ll also find tips on how to integrate them into your infrastructure. We’ll take you through cluster and internal metrics, as well, to ensure you don’t miss a beat! 

First, let’s go through why you need a Kubernetes monitoring solution in more detail. 

A man looking at a laptop with multiple charts showing on the screen with his eyeglasses and mobile on the table.
Kubernetes helps you keep everything under control.

Kubernetes Monitoring and Why It Matters

Monitoring is essential to know what’s happening at any time within your ​​​​Kubernetes system. It’s a bit like driving, meaning you need clear visibility. Imagine driving in the fog on a road with hairpin bends and no fog lights! It’s the same concept for your data management; you can’t monitor it without essential Kubernetes monitoring tools. Anything can happen, from uncatered-to data overheads to overlooking resource-consuming injection attacks. Your system can be in peril because of what you don’t know.

Key Monitoring Metrics 

Metrics give you an overview of your system’s performance, enabling you to make the precise changes you need. The metrics range from network bandwidth information to security vulnerability analysis. All these are critical to operating a Kubernetes system. 

Since you’re likely running Kubernetes in a cluster environment, here are the key metrics you need when managing this environment. If you aren’t using a cluster environment, most metrics still apply except inter-node I/O. 

Cluster Metrics

Metrics should help you get a clear picture of the deployed workload in a Kubernetes cluster. You’ll need information on the number, health, and availability of pods and containers. That way, you’ll analyze your Kubernetes groups and storage. These metrics will also help you assess your software packages, including code, libraries, and other dependencies. That means you’ll get an in-depth view of your cluster.

Other metrics help you uncover data like the number, readiness, memory, and network availability of your cluster environment’s nodes. Nodes are servers that host all data and applications in Kubernetes. The more nodes you have, the more queries and users the system can handle. Metrics also help reduce data loss risk on the system down events due to the replication activities taking place between nodes. 

Once you know this information, you’ll also need the system’s hardware utilization. These include data on memory utilization, CPU utilization, disk, and network I/O overhead. This information helps you analyze if the resource utilization in the cluster environment is adequate and balanced across nodes. 

Resource utilization is the number of system resources in use and resources available for use at any time. It’s good to remember that some programs add logs while others don’t shut down correctly. If you’ve exceeded the number of systems in use, the system will fall over, even resulting in a system shutdown. Clusters can compensate, but only until replication spreads across nodes. That’s why monitoring cluster environments is essential! 

It’s also key to monitor the control plane components run through the master nodes, like API server, controller scheduler, and Etcd. That way you’ll get a detailed view of the cluster performance.

Now that we’ve covered the basics about Kubernetes monitoring, let’s dive right into the top tools in this exciting space.

Top 6 Tools in the Kubernetes Monitoring Space

1. Prometheus

a prometheus dashboard with various chargers and a gauge showing 29%.
Everything looking alright on this dashboard

Prometheus is an open-source, enterprise-grade monitoring tool for containerized environments. It helps monitor thousands of machines simultaneously with a single server. Prometheus also provides comprehensive metrics without affecting the containers’ system performance during monitoring. 

The following table identifies Prometheus’ main features:

Prometheus’ Main Features
  • Offers enterprise-level data monitoring solution
  • Uses a multidimensional data model to monitor data
  • Procures accurate time-dependent data
  • Displays data visually through the built-in expression browser or Grafana integration
  • Records data using the HTTP protocol providing platform flexibility
  • Scrapes targets periodically
  • Shows metrics in human-readable or visualized, self-explanatory formats
  • Handles queries through Prometheus’s PromQL language
  • Flags queries through user alerts
  • Discovers targets automatically using the Kubernetes service discovery
  • Imports data from other platforms including Docker, HAProxy, JMX, and StatsD

How Does Prometheus Extract Metrics?

Prometheus can access data directly from an application’s client libraries. It starts by using the Kubernetes API to discover targets. Then, it retrieves machine-level metrics from the application information. At this point, you can access the data using the PromQL query language and export it to a graphical interface for analysis.

2. Sensu

Sensu is an open-source infrastructure and application monitoring tool. It provides an in-depth understanding of how containers, services, servers, and connected devices operate in the cloud. Sensu also offers an end-to-end observability pipeline where you can collect and transform monitoring events and send them to any database you wish. That way, you have more options to store and analyze your monitoring data. That’s great for monitoring since it’s better to have multiple views for your data. 

Sensu has a simple setup and provides cluster health and visualization. It can also run in parallel with Prometheus in your Kubernetes cluster or natively without it. That’ll give you different perspectives on the same data and help you troubleshoot issues faster.

The following show Sensu’s main features:

Sensu’s Main Features
  • Triggers service restart
  • Runs custom scripts
  • Assists in Kubernetes self-healing through third-party API corrective measures
  • Allows definition without coding using pre-configured templates
  • Acts as declarative configuration files like code with the ability to edit, receive, and create versions
  • Supports incident response
  • Sends alerts and notifications
  • Integrates notifications with third-parties
  • Identifies, registers, and de-registers servers
  • Provisions virtual machines, containers, services, and public cloud computing instances
  • Enables applications, functions, and connected devices to work coherently
a laptop that is connected to the internet and is sending and receiving data and messages
No laptop is an island on its own!

3. OverOps

OverOps aims to solve the issues resulting from a lack of monitoring in containerized applications. It helps identify, prevent, and resolve critical software issues in these applications.

The tool continuously monitors and analyzes code for anomalies at runtime. Its value-add is that it analyzes code at runtime and captures the full Java virtual machine (JVM) state without relying on logs or other metrics. That way, it uncovers issues that other monitoring tools missed. 

An exciting OverOps feature is the automated root cause (ARC) screen. It enables pinpointing specific lines of code, container state, and deployment as the root failure mechanism. When it encounters an anomaly, OverOps sends alerts, ensuring the relevant personnel know about it. This helps developers get in-depth knowledge about the complete container state at the same moment an error occurs. That also helps resolve errors before aggravating the situation and, worse, impacting customers.

The following shows the main features of OverOps:

OverOps Main Features
  • Analyzes root cause
  • Assesses applications at runtime
  • Benefits both testing and production purposes
  • Identifies and manages runtime exceptions
  • Produces code error reporting for analysis
  • Resolves code issues by routing to the correct development team
  • Supports incident response
  • Stops bad code automatically
  • Reduces cascading errors
  • Analyzes backend Java or .NET 

4. Grafana

Grafana is an open-source multi-platform tool for monitoring and observation. It helps monitor data over a period of time and connects with every available source. It also supports dynamic dashboards with many graphs, histograms, Geo maps, and template variables. That way you can visualize metrics and logs quickly and in multiple ways. 

The tool features a built-in alert system that enables you to visually define alert rules for critical metrics. It also enables data-source-specific queries that help specify and identify a data source on a per-query basis. This is done by mixing different data sources in the same graph. 

The following shows the main features of Grafana:

Grafana Main Features
  • Monitors data
  • Filters data capabilities
  • Authenticates capabilities
  • Analyzes Prometheus data
  • Helps track application behavior in production
  • Assesses both frequency and type of errors encountered in a production environment
  • Supports cross-organizational collaboration
  • Stops bad code automatically
  • Reduces cascading errors
  • Analyzes back-end Java or .NET 

5. Graphite

Graphite is an enterprise-level monitoring tool for time-dependent metric analysis. It stores numeric time-dependent metrics and then renders graphs. Graphite doesn’t collect the data; instead, a component called Carbon passively listens. 

The following shows Graphite’s main features:

Graphite Main Features
  • Offers enterprise-level data monitoring solutions
  • Enables monitoring of individual programs through its Carbon component
  • Takes data from the Carbon components applications use
  • Stores data in the Whisper database
  • Assesses time-dependent data streams
  • Assesses production environment errors in real-time
  • Compatible with many different plug-ins

6. Datadog

a pug wearing spectacles holds a stick and points to a chart on a white board.
The world would be a better place if dogs could do presentations.

Datadog is a monitoring and observability tool that helps monitor, troubleshoot, determine, and optimize application performance. It extracts metrics, logs, events, and service states from Kubernetes in real-time. 

You also can use Datadog to automatically search and analyze logs for troubleshooting and open-ended data exploration. Its UI offers customizable dashboards showing graphs composed of multiple data sources in real-time. 

The following shows the Datadog’s main features:

Datadog Main Features
  • Enables automatic monitoring across the Kubernetes platform
  • Creates repeatable processes
  • Deploys, manages, and shares monitoring schemas
  • Sends alerts on various platforms
  • Provides a visual representation of enterprise-level data
  • Handles metrics and events of 500+ integrated solutions
  • Assesses metrics with a tag-orientated approach

The Verdict

We can draw some conclusions from the above. One is that Prometheus is the leading Kubernetes monitoring tool along with Grafana. These help to visualize monitoring data, making management easier. Another conclusion is that other Kubernetes monitoring tools, like Datadog and Sensu, can be powerful when tied together to form an entire monitoring toolchain. Your choice depends on what metrics you need to monitor and your use cases. 

Final Thoughts

Kubernetes monitoring tools help you achieve top-level visibility for your data. So, you also can choose the appropriate tools based on your unique needs and use case. That said, the Kubernetes ecosystem is constantly growing and has even become quite crowded lately. 

If you’re new to Kubernetes monitoring tools, Cloud Native Computing Foundation (CNCF) projects, like Prometheus and Grafana, are good choices. They have a large and active community backing them and constantly evolve to bring better solutions. Once you’re up to speed with these, you can graduate to more robust and feature-packed paid tools, like Datadog

So, when it comes to monitoring, having the right tool mix in your arsenal is vital. This article gives you an overview of the best options you can choose from.



How do you monitor Kubernetes?

You can track key metrics for containers, pods, nodes, networking, availability, and security. The community offers diverse tools that are well-integrated and purpose-built for Kubernetes. Use our guide to check the top 6 open-source Kubernetes monitoring tools. Through monitoring and managing data, you ensure your system is working at peak efficiency.

What are the tools for container monitoring?

Prometheus is the leading Kubernetes monitoring tool along with Grafana. These help to visualize monitoring data, making management easier. Other tools, like Datadog and Sensu, can be powerful when tied together to form an entire monitoring toolchain. This gives you granular detail about program performance on a Kubernetes system.

How do I check Kubernetes’ performance?

Kubernetes’ performance depends on the performance of the containers, pods, nodes, and network. Identify key metrics on their health, availability, and utilization to improve Kubernetes’ performance. Failing to monitor the system’s health may mean one or more nodes fall over, impacting users.

How fresh should your Kubernetes monitoring data be?

Real-time data is the standard and a must for cluster environments. Prometheus excels at delivering time-dependent data for Kubernetes in real-time. Some alternate tools may have a few seconds of delay, but anything beyond this is unacceptable in the Kubernetes world. The better the resolution you achieve, the more likely you’ll assess a system’s performance effectively.

What is the best free monitoring tool for Kubernetes?

Prometheus is the best and most powerful ​​​​Kubernetes monitoring tool available today. It delivers time-based data that reports on Kubernetes’ health and performance in real-time. This means you don’t lose key data for analytics, ensuring you never miss a beat!



Best friends: Kubernetes & Prometheus

Read about why Kubernetes and Prometheus are better together.

More Open-Source Monitoring Tools

Check this list for more open-source tools that monitor Kubernetes.

Kubernetes Monitoring Startups

Get to know the top Kubernetes monitoring startups here.

Prometheus’ Official Website

Discover more about Prometheus from their official website.

Datadog’s Official Website

Learn more about Datadog from their website.

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