Splunk announced on October 20, 2020 that it had completed its acquisition of Plumbr and agreed to acquire Rigor. Plumbr had already closed on October 5, while Rigor’s acquisition closed on November 5, 2020. Together, the transactions expanded Splunk Observability across application performance monitoring (APM), real-user monitoring (RUM), digital experience monitoring (DEM) and synthetic testing.
What did Splunk acquire?
Splunk acquired 100% of OÜ Plumbr, an Estonian company, and 100% of Rigor, Inc. Plumbr strengthened monitoring of application internals and live-user behavior. Rigor added tools for testing digital experiences from the outside, including websites and APIs.
| Company | Announcement context | Legal closing date | Main capabilities added |
|---|---|---|---|
| Plumbr | Acquisition completed before the October 20 announcement | October 5, 2020 | APM, auto-instrumentation, RUM, database monitoring and code profiling |
| Rigor | Definitive agreement announced October 20, 2020 | November 5, 2020 | DEM, synthetic monitoring and web/API optimization |
When did the acquisitions happen?
Plumbr closed before the announcement
Splunk’s October 20, 2020 announcement said the Plumbr acquisition was complete. Splunk’s SEC filing identifies October 5, 2020 as the date it acquired all of OÜ Plumbr. The filing says Plumbr’s results were included from that purchase date.
Rigor was announced first and closed later
The same announcement described Rigor as a signed agreement, not a completed transaction. Splunk’s later filing records November 5, 2020 as the acquisition date. Splunk’s acquisition page uses October 20, 2020 when describing the deal publicly, so the announcement date and legal closing date should not be treated as the same event.
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What Plumbr added to Splunk Observability
Splunk described Plumbr as an application-performance-monitoring company with auto-instrumentation, real-user monitoring and deep application insights. Its technology supported Java, PHP, Python and .NET applications, as well as database monitoring and code profiling.
- Auto-instrumentation: helped collect application telemetry without requiring every monitoring hook to be written manually.
- APM: provided visibility into application performance and the components contributing to slow or failing transactions.
- RUM: captured performance signals from actual users and their devices or sessions.
- Code and database insight: extended diagnosis beyond high-level availability into execution and data-layer behavior.
In Splunk’s current acquisition description, Plumbr is associated with enhanced auto-instrumentation, RUM and deep APM capabilities in Splunk Observability.
Rank #2
What Rigor added
Rigor brought digital experience monitoring focused on the user-facing side of performance. Its synthetic-monitoring tools could repeatedly test websites and APIs, helping teams find, fix and prevent problems before or between real-user incidents.
- Synthetic monitoring: scripted tests could represent expected journeys or API checks from outside the application.
- DEM: focused on whether customers could successfully and quickly use digital channels.
- Optimization: supported investigation of web and API performance issues that affect user experience.
Splunk says Rigor’s synthetic-monitoring capabilities were adopted into Splunk Observability.
Rank #3
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How the two technologies complemented each other
| Comparison | Plumbr | Rigor |
|---|---|---|
| Monitoring approach | Instrumentation and telemetry from applications and real users | Externally run synthetic tests and digital-experience checks |
| Primary scope | Application internals, code paths, databases and live sessions | Websites, APIs and customer-facing journeys |
| Typical question answered | Why is this application or transaction slow? | Can a user complete this journey, and is the endpoint responding correctly? |
| Observability role | APM and RUM | DEM and synthetic monitoring |
The strategic logic was to combine inside-the-application diagnosis with outside-in checks of the experience customers actually encounter. Splunk presented that combination as a broader observability offering for cloud and on-premises environments.
What did the deals cost?
Rigor consideration
Splunk’s Q3 fiscal 2021 filing reported approximately $38.0 million as the estimated fair value of consideration for Rigor at that measurement point. Splunk’s fiscal 2022 Form 10-K later reported $37.6 million in cash consideration for Rigor. Those figures use different filing periods and wording, so they should not be presented as a single unchanged figure.
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Plumbr price
Splunk did not disclose a standalone purchase price for Plumbr. Its fiscal 2022 Form 10-K reported $31.6 million as the aggregate purchase price for Plumbr and Flowmill together. That combined amount cannot be used as Plumbr’s individual valuation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why Splunk said it made the acquisitions
Splunk said the transactions would broaden its APM and DEM offerings and create a more integrated observability experience across cloud and on-premises applications. Tim Tully, Splunk’s chief technology officer, said in the October 20, 2020 release: “Together, Plumbr and Rigor accelerate Splunk’s vision to deliver a comprehensive Observability Suite with best-in-class DEM and APM for all applications.”
Quick Recap
What to remember
- The announcement date was October 20, 2020.
- Plumbr had already closed on October 5, 2020.
- Rigor closed on November 5, 2020, after the announcement-era agreement.
- Plumbr contributed APM, auto-instrumentation and RUM; Rigor contributed DEM, synthetic monitoring and optimization.
- Rigor’s later disclosed cash consideration was $37.6 million, while the $31.6 million figure covered Plumbr and Flowmill together.
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