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Cloud · head to head

Thanos vs OpenTelemetry

Thanos logo

Thanos

Cloud

Highly available Prometheus with long-term object storage

From
Free
Rated
-
Full reviewWebsite
OpenTelemetry logo

OpenTelemetry

Cloud

Vendor-neutral standard for traces, metrics and logs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Thanos several components — sidecar, store, querier, compactor, ruler — each with its own configuration and failure modes; OpenTelemetry genuinely complex to adopt: collectors, pipelines, samplers and exporters are a system to run in their own right
  • They diverge on capability: Thanos covers Global query, OpenTelemetry covers Vendor-neutral SDKs.

Where they differ

Only the attributes on which Thanos and OpenTelemetry actually diverge.

Attributes where Thanos and OpenTelemetry differ
AttributeThanosOpenTelemetry
PlatformsKubernetes, Linux, DockerLinux, macOS, Windows, Kubernetes, Docker

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated), category (Cloud).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Thanos

  • Global query
  • Object storage retention
  • Deduplication
  • Downsampling

Only in OpenTelemetry

  • Vendor-neutral SDKs
  • Collector
  • Three signals
  • Auto-instrumentation

What people use each for

The jobs each tool is most often brought in to do.

Thanos

  • Querying metrics across many clusters or regions from one placenot OpenTelemetry
  • Retaining metrics for years without local disk growthnot OpenTelemetry
  • Removing the gap that appears when a single Prometheus instance restartsnot OpenTelemetry

OpenTelemetry

  • Instrumenting once and keeping the option to change observability vendor laternot Thanos
  • Standardising telemetry across services written in different languagesnot Thanos
  • Routing and filtering telemetry centrally to control observability spendnot Thanos

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Thanos

  • Several components — sidecar, store, querier, compactor, ruler — each with its own configuration and failure modes
  • The compactor is a common source of operational trouble and must not run twice against the same bucket
  • Query latency over object storage is meaningfully higher than local Prometheus
  • Object storage costs and API request charges become real at high volume

OpenTelemetry

  • Genuinely complex to adopt: collectors, pipelines, samplers and exporters are a system to run in their own right
  • Language SDKs mature at different rates, so a polyglot estate gets uneven support
  • It produces and moves telemetry but does not store or visualise it, so a backend is still required and still billed

Pricing, plan by plan

Thanos

Free
  • ThanosFree
    • Full functionality
    • No usage limits
    • Community support

OpenTelemetry

Free
  • OpenTelemetryFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose Thanos if

  • You need global query.
  • You want to start without paying.
  • You work on Kubernetes, Linux, Docker.
  • You also want object storage retention.
Thanos review

Choose OpenTelemetry if

  • You need vendor-neutral sdks.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Kubernetes, Docker.
  • You also want collector.
OpenTelemetry review

Questions people ask

Is Thanos or OpenTelemetry better?
Neither clearly leads. Thanos starts at Free and OpenTelemetry at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Thanos or OpenTelemetry?
Thanos starts at Free and OpenTelemetry at Free.
Does Thanos or OpenTelemetry run on more platforms?
Thanos runs on Kubernetes, Linux, Docker. OpenTelemetry runs on Linux, macOS, Windows, Kubernetes, Docker.
Can I use Thanos for free?
Both have a free tier, so you can try either at no cost before committing.
What is Thanos best used for?
Thanos is most often used for querying metrics across many clusters or regions from one place, retaining metrics for years without local disk growth, removing the gap that appears when a single prometheus instance restarts. Of those, querying metrics across many clusters or regions from one place and retaining metrics for years without local disk growth are not what OpenTelemetry is typically brought in for.
What can Thanos do that OpenTelemetry cannot?
Thanos covers Global query, Object storage retention, Deduplication, Downsampling. OpenTelemetry covers Vendor-neutral SDKs, Collector, Three signals, Auto-instrumentation.

Answered from the vendors’ own pages

Thanos: Is Thanos free?

Yes, open source and CNCF-incubating. Costs are the object storage it uses.

OpenTelemetry: Is OpenTelemetry free?

Yes, open source under the CNCF. What you pay for is the backend you export to.

Thanos: Does Thanos replace Prometheus?

No. It runs alongside existing Prometheus servers, adding global query, deduplication and long-term storage.

OpenTelemetry: Does OpenTelemetry replace Datadog or Grafana?

No. It replaces their proprietary agents and instrumentation libraries. You still need a backend to store and query the data.

Thanos: Thanos or VictoriaMetrics?

Thanos layers onto Prometheus using object storage and is the more established multi-cluster answer. VictoriaMetrics is a separate store aiming at lower resource use and fewer moving parts.

OpenTelemetry: Why adopt a vendor-neutral standard?

Because instrumentation is the expensive part. Once code emits OTel, changing observability vendor is a collector config change instead of re-instrumenting every service.

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