OpenTelemetry.io 2025 review
As 2025 has come to an end, we’re taking a moment to look back at everything the community accomplished across the website, documentation, and localization efforts. The year was another exciting chapter for OpenTelemetry.io, and we are thrilled to share some of the highlights with you.
Highlights of 2025
Where 2024 introduced the foundation of multilingual documentation, 2025 is when localization became a core pillar of OpenTelemetry.io. This means more contributors, more translations, more supported languages, and more visibility for localized content.
We also embarked on an innovative solution to one of the biggest challenges for OpenTelemetry users. The Ecosystem Explorer project makes it easier to find and understand all available options for configuring instrumentation and collecting telemetry.
Localization: A breakout year
Localization has been one of the standout achievements of 2025. Building on the five locales introduced in 2024, this year we launched three new languages:
This brings us to eight supported locales, marking a major milestone in accessibility and global reach.
Localization activity by the numbers
Across all locales, contributors delivered:
- 74,825 lines of translated content
- 483 localized files
- 523 localization-specific commits
- 65 unique contributors across languages
Taken together, these numbers show that localization has become one of the most active and vibrant areas of contribution in the entire OpenTelemetry ecosystem.
Translation completeness
Localizing an ever-changing documentation set requires significant time and effort. Our localization teams have been working hard to add more translated content every day. At year-end, the Japanese localization was in the lead with 28% coverage:
- Japanese — 28% (169 files)
- Chinese — 24% (147 files)
- Portuguese — 18% (109 files)
- Spanish — 13% (79 files)
- French — 9% (57 files)
- Bengali — 3% (17 files)
- Ukrainian — 1% (7 files)
- Romanian — 1% (4 files)
Most active localization contributors
A few contributors played a major role in sustaining and expanding localized documentation:
- Masaki Sugimoto (@Msksgm) — 127 commits (Japanese)
- Vitor Vasconcellos (@vitorvasc) — 74 commits (Portuguese + cross-locale workflow improvements)
- Michael Yao (@windsonsea) — 49 commits (Chinese)
- Patrice Chalin (@chalin) — cross-locale maintenance, validation, and infrastructure
Ecosystem Explorer: Unlocking the power of our metadata
Beyond documentation and localization, 2025 was also the year the OpenTelemetry Ecosystem Explorer initiative took shape under the Communications SIG.
As the OpenTelemetry ecosystem grows, it’s become harder for users to answer basic but critical questions:
- Which libraries and technologies are instrumented?
- What telemetry (spans, metrics, attributes) do they emit?
- How does that telemetry change across versions and configurations?
The existing OpenTelemetry Registry helps users discover components, but it requires significant manual upkeep and doesn’t always provide the depth of information needed.
A proof-of-concept, the Instrumentation Explorer, already shows what this can look like for the Java agent: you can inspect instrumentations, see emitted telemetry, and compare behavior across versions and configurations.
Special kudos to Jay DeLuca (@jaydeluca) for driving this effort and for the original Java Instrumentation Explorer prototype that inspired the broader project.
Year in numbers
In 2025, we saw tremendous growth not only across commits and files, but also in our own team.
Contributions
Comparing the periods December 2023 to November 2024 and December 2024 to November 2025, we observed an upward trend in commits and files changed:
- Commits increased 43% from 1,340 to 1,913.
- Files changed increased 16% from 1,624 to 1,888.
- PRs merged grew 50% from 1,374 to 2,067.
- The only stat that declined was the number of contributors, which decreased from 106 to 73 (31%).
Since the repository’s inception in April 2019, the community has seen remarkable growth, with:
- 5,966 merged pull requests (7,061 commits) by
- More than 1,000 contributors (1,002 to be exact!)
Thank you to every contributor for helping to build and improve the OpenTelemetry website. Your efforts make a difference!
Team spirit
The Communications SIG, which manages Opentelemetry.io, also grew this year! We added two new maintainers, two new approvers, and we created the triager role where we welcomed six new triagers.
Our group of 15 is excited to continue our stewardship of the OpenTelemetry website and documentation in 2026. We look forward to helping contributors, new and experienced alike!
Popular pages
Our public analytics shows data for page views and popular pages. According to the data from December 1, 2024 to November 30, 2025, opentelemetry.io was viewed more than 13 million times across 5 million sessions (up from 12 million views and 4 million sessions in 2024).
Looking at the most visited documentation pages, a few sections stand out:
| Page/section | Views | % of all views 1 |
|---|---|---|
| Collector | 790K | ~6.0% |
| Concepts | 725K | ~5.5% |
| Languages | 434K | ~3.3% |
| Getting Started | 326K | ~2.5% |
| Demo | 298K | ~2.3% |
Looking ahead
This year is shaping up to be another exciting year for the OpenTelemetry project! As part of our preparation for the project’s graduation from Cloud Native Computing Foundation (CNCF) incubation, the Communications SIG will be making some important website improvements, including a redesign of the homepage and a complete refactoring of the Collector docs.
Whether you’re an end user, a contributor, or simply enthusiastic about OpenTelemetry, we invite you to get involved. You can contribute by raising issues, participating in discussions, or submitting PRs.
You can also join us:
- On the CNCF Slack at any one of the many
#otel-prefixed channels. - In Comms meetings, held every other Tuesday at 9:00 AM Pacific time.
Let’s make 2026 another amazing year for opentelemetry.io!
Percentage of the site-total 13M views. ↩︎