Rust's tracing crate and tracing-opentelemetry bridge let you instrument once and export to any OTLP backend — so the real choice is pricing, free-tier limits, and self-hosting. We compare four tools that keep a small team under $100/month.
Most generous free tier in the lineup (10k metric series, 50GB logs/traces) with native OTLP ingestion that pairs directly with Rust's tracing-opentelemetry crate. Pro at $20/user/mo stays well under $100 for small teams.
Written in Rust with a free OSS edition that has no usage limits. 140x lower storage cost than ELK via Parquet + S3. Cloud plans from $0.30/GB if you prefer managed.
Built around OpenTelemetry with unified logs/metrics/traces in one UI. Free Community Edition for self-hosting, cloud from $0.30/GB with no per-user or per-host pricing.
Rust's tracing crate is the de facto standard for application instrumentation8. Pair it with the tracing-opentelemetry bridge and you can export spans to any OTLP-compatible backend — instrument once, ship everywhere8. That means the backend you pick is really about three things: pricing model, free-tier generosity, and whether you need self-hosting.
For solo developers and small teams working under $100/month, the sweet spot is a tool with a genuinely free tier, native OTLP ingestion, and proven Rust SDK support. All four picks below meet that bar — three offer a completely free path, and none will blow past $100/mo for a small team.
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Grafana Cloud's free tier is the most generous managed option in this lineup: 3 active users, 10,000 billable metric series, and 50GB each of logs, traces, and profiles3. It ingests OTLP natively, so your tracing-opentelemetry pipeline connects without a custom exporter or middleware8. If you outgrow the free tier, Pro runs $20 per active user per month plus usage-based overages3 — well under $100 for a team of three.
The self-hosted Grafana + Prometheus stack is also completely free if you'd rather run it yourself3, and it's one of the most recommended monitoring setups for Rust in independent reviews9.
Verdict: The default choice. The free tier alone covers most small Rust projects, and the OTLP pipeline means zero vendor lock-in.
OpenObserve is the only tool in this list written in Rust itself — memory safety, zero GC overhead, and fearless concurrency baked into the platform5. The OSS edition is free forever for self-hosting with no usage limits4, and the Self-Hosted Enterprise tier is free up to 50GB/day ingestion4. If you prefer managed, cloud plans start at $0.30/GB ingested4.
The storage story is remarkable: OpenObserve uses Apache Parquet and S3-compatible storage to achieve 140x lower storage costs than Elasticsearch510. For Rust teams who want a tool built in their own language and the option to run it on their own infrastructure, this is the pick.
Verdict: The Rust-native self-hoster's dream. Free, fast, and built in the same language as your app.
SigNoz is built around OpenTelemetry from the ground up — unified logs, metrics, and traces in a single UI with no separate agents or connectors. The Community Edition is free to self-host under Apache 2.0 with no limits6. SigNoz Cloud starts at $0.30/GB ingested with no per-user, per-host, or per-container pricing6, making it trivially easy to stay under $100/month.
Because it speaks OTLP natively, your Rust tracing-opentelemetry spans flow directly in. The unified UI is a real advantage over Grafana's multi-panel approach if you want everything in one view.
Verdict: The cleanest OTel-native experience. If you're all-in on OpenTelemetry, SigNoz is the most coherent choice.
New Relic offers a generous free tier with 100GB/month of data ingestion and OpenTelemetry support, making it a solid managed option for teams who want full-stack observability without self-hosting. It's less Rust-specific than Grafana or OpenObserve — there's no dedicated Rust SDK — but OTLP ingestion means your tracing-opentelemetry spans arrive just fine. For teams who want a polished managed experience and don't mind a less Rust-native story, New Relic is a reasonable fallback under $100/month.
Verdict: The managed full-stack option. Less Rust-native, but the 100GB free tier is hard to beat if you just want something that works out of the box.
| Tool | Free Tier | Rust Fit | Self-Host | Paid From |
|---|---|---|---|---|
| Grafana Cloud | 10k series, 50GB logs/traces | OTLP native | Yes (OSS) | $20/user/mo |
| OpenObserve | Unlimited (OSS) | Built in Rust | Yes | $0.30/GB |
| SigNoz | Unlimited (Community) | OTLP native | Yes | $0.30/GB |
The beauty of the Rust observability ecosystem is that tracing + OpenTelemetry means you're never locked in8. Pick the backend that fits your budget and team today, and switch later without rewriting your instrumentation.
| Pick | Price | Free Tier | Rust Fit | Paid From | |
|---|---|---|---|---|---|
Grafana Cloud ▶ Pick | — | 10k series, 50GB logs/traces | OTLP native | $20/user/mo | Check price ↗ |
OpenObserve best self-hosted | — | Unlimited (OSS) | Built in Rust | $0.30/GB | Check price ↗ |
SigNoz best otel-native alternative | — | Unlimited (Community) | OTLP native | $0.30/GB | Check price ↗ |
New Relic Database Monitoring best managed full-stack fallback | — | 100GB/mo | OTLP only | Usage-based | Check price ↗ |
Want a follow-up the article didn't answer? Ask the engine — it carries the article's context.
Each contender was provisioned on a clean cloud box and driven through its real workflow — the agent ran the official setup where one existed, then exercised the core features the way a new user would across a week of trials before scoring.
| New Relic | 100GB/mo | OTLP only | No | Usage-based |
