Editorial guide · 5 tools compared

Best Open-Source Tracing, Metrics, and Telemetry Backends

Metrics backends, tracing backends, and telemetry collectors all matter, but they do different jobs. Strong teams pick them based on where they sit in the pipeline, not because they share an observability brand or a vague open-source label.

Help teams choose between open-source telemetry collection layers and observability backends based on where each tool sits in the stack, how the managed path works, and what costs become visible at scale.

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What to look for

Key considerations before you choose.

Grafana Alloy belongs in the collection and routing layer. Grafana Tempo and Grafana Mimir are backend choices for traces and metrics. OpenTelemetry is the broader standard around instrumentation and collection, while Prometheus is still foundational on the metrics side.
That distinction is what keeps the comparison honest. The wrong comparison treats these tools as if they are interchangeable products, when they actually sit in different parts of the telemetry path.
Grafana stands out because the official pricing page makes the managed route visible for metrics and traces instead of hiding the economics behind a demo form. Tempo and Mimir benefit from that directly, while Alloy inherits the broader Grafana Cloud platform context rather than a standalone SKU.
That matters because open-source telemetry software is rarely free in production once retention, ingestion volume, and operations start to matter. The best editorial comparison makes those operational costs visible without flattening everything into one price number.

Deep dive

How this category actually breaks down.

Collector versus backend is the first decision

Grafana Alloy belongs in the collection and routing layer. Grafana Tempo and Grafana Mimir are backend choices for traces and metrics. OpenTelemetry is the broader standard around instrumentation and collection, while Prometheus is still foundational on the metrics side.

That distinction is what keeps the comparison honest. The wrong comparison treats these tools as if they are interchangeable products, when they actually sit in different parts of the telemetry path.

The managed upgrade path is part of product quality

Grafana stands out because the official pricing page makes the managed route visible for metrics and traces instead of hiding the economics behind a demo form. Tempo and Mimir benefit from that directly, while Alloy inherits the broader Grafana Cloud platform context rather than a standalone SKU.

That matters because open-source telemetry software is rarely free in production once retention, ingestion volume, and operations start to matter. The best editorial comparison makes those operational costs visible without flattening everything into one price number.

Recommended tools

Curated picks for this workflow.

Top pick

InfrastructureTracing backend

Open-source, high-scale distributed tracing backend with a public managed path through Grafana Cloud Traces.

Why it stands out

Choose Grafana Tempo when the team needs a serious open-source tracing backend with a visible managed route.

Grafana TempoDistributed tracing

InfrastructureMetrics backend

Open-source, horizontally scalable, multi-tenant long-term storage backend for Prometheus metrics with a clear managed route through Grafana Cloud Metrics.

Why it stands out

Choose Grafana Mimir when the team needs serious Prometheus-compatible metrics storage and scale.

Grafana MimirMetrics

InfrastructureTelemetry pipeline

Open-source OpenTelemetry Collector distribution with built-in Prometheus pipelines for collecting metrics, logs, traces, and profiles.

Why it stands out

Choose Grafana Alloy when the team needs a serious collector layer that spans both OTel and Prometheus-style telemetry.

Grafana AlloyOpenTelemetry Collector

InfrastructureInstrumentation standard

Open standard for collecting traces, metrics, and logs across apps and infrastructure.

Why it stands out

Collector YAML benefits from code review like application config

OpenTelemetryObservability

InfrastructureMetrics

Open source metrics and alerting system built for time series collection, queries, and rule based alerts.

Why it stands out

Datadog or New Relic replace ops burden with per-host or per-GB fees.

PrometheusMetrics

Quick comparison

Grafana Tempo vs Grafana Mimir

Full comparison

Overview

Open-source, high-scale distributed tracing backend with a public managed path through Grafana Cloud Traces.

Open-source, horizontally scalable, multi-tenant long-term storage backend for Prometheus metrics with a clear managed route through Grafana Cloud Metrics.

Best for

Distributed tracing backend
Managed Grafana Cloud Traces adoption
Open-source tracing infrastructure

Prometheus long-term storage
Open-source metrics backend
Managed Grafana Cloud Metrics adoption

Strengths

One of the clearest open-source tracing backend choices in the Grafana ecosystem
Managed pricing is publicly visible, which improves editorial comparison quality
Good fit for teams that want OSS tracing now and managed traces later

One of the clearest backend choices for serious Prometheus-scale metrics storage
Official pricing for the managed route is public and usable in comparisons
Strong fit for teams that want OSS metrics infrastructure without losing a future managed option

Not ideal for

Teams that only need a collector and routing layer rather than a trace backend
Organizations that want an all-in-one observability platform decision instead of a tracing-specific backend choice
Buyers who do not expect to own or reason about trace retention and ingestion economics

Teams that want a broader all-in-one observability platform decision more than a metrics backend decision
Organizations without Prometheus-style metrics needs
Buyers who want only a lighter developer tool instead of backend infrastructure

Pricing

Free plan available

Grafana Tempo is free open-source software, while managed pricing is sold through Grafana Cloud Traces. Grafana's official pricing page currently shows Free at $0 with 50 GB ingested per month, Pro with a $19/month platform fee plus $0.05/GB process, $0.40/GB write, and $0.10/GB retain, and Enterprise as custom with a $25,000 annual minimum commit.

Verified 2026-04-01 · Official pricing

Free plan available

Grafana Mimir is free open-source software, while managed pricing is sold through Grafana Cloud Metrics. Grafana's official pricing page currently shows Free at $0 with 10k active series per month, Pro at $6.50 per 1k series plus a $19/month platform fee, and Enterprise as low as $3 per 1k series with a $25,000 annual minimum commit.

Verified 2026-04-01 · Official pricing

Editor notes

Grafana Tempo should be framed as backend tracing infrastructure with a transparent managed path, not just as a Grafana ecosystem add-on.

Choose Grafana Tempo when the team needs a serious open-source tracing backend with a visible managed route.
Grafana Alloy is the collector-side comparison inside the same ecosystem, not a direct substitute.
Grafana Loki and Grafana Mimir cover adjacent logs and metrics backend roles.
The published Traces rates make Tempo easier to compare than many OSS tracing projects with vague commercial packaging.

Grafana Mimir should be positioned as a metrics backend choice and long-term storage layer, not just as generic monitoring software.

Choose Grafana Mimir when the team needs serious Prometheus-compatible metrics storage and scale.
Prometheus is simpler and more foundational, while Mimir is the stronger backend story for larger environments.
Grafana Tempo is the tracing-side counterpart in the same ecosystem.
The managed Grafana Cloud Metrics pricing is a genuine strength because it makes the OSS-to-managed path easier to compare.

Visit Grafana Tempo

Visit Grafana Mimir

Bottom line

The shortest honest answer.

FAQ

Questions people usually have before they choose.

What is the difference between Grafana Alloy and Grafana Tempo?

Grafana Alloy is a collector and telemetry pipeline distribution, while Grafana Tempo is a tracing backend. Alloy helps gather and route telemetry. Tempo stores and serves traces.

Is Grafana Mimir just Prometheus?

No. Prometheus is foundational for metrics collection and querying, while Grafana Mimir is positioned as long-term, scalable, multi-tenant storage for Prometheus metrics. They are related, but they solve different scale and storage problems.

Are these tools actually free?

The open-source software is free to adopt, but production cost still shows up in telemetry volume, retention, infrastructure, and operations. Grafana's managed pricing makes those tradeoffs easier to understand for Tempo and Mimir in particular.

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Best Open-Source Tracing, Metrics, and Telemetry Backends