Riemann

Spec sheet

Purpose

Riemann aggregates events from servers and applications and processes them with a stream processing language.Read 11 Oct 2026 · riemann.io

Intended users

The site describes Riemann as intended for operations staff managing large, dynamic infrastructure and engineers investigating production errors and performance bottlenecks.Read 4 Oct 2026 · riemann.io

Audience

The maker describes Riemann as intended for operations staff managing large dynamic infrastructure and engineers investigating production errors and performance bottlenecks.Read 11 Oct 2026 · riemann.io

Deployment

The maker documents running Riemann in Docker and provides a prepackaged riemannio/riemann image.Read 11 Oct 2026 · riemann.io

Integrations

The maker lists forwarding events to Graphite and a built-in Librato Metrics integration.Read 11 Oct 2026 · riemann.io

Security

Riemann supports bidirectional TLS authentication for TCP connections, and its documentation also describes using a VPN or SSH tunnel.Read 11 Oct 2026 · riemann.io

Support

The maker directs users to IRC, a mailing list, or GitHub Issues for help and describes Riemann as a volunteer effort.Read 11 Oct 2026 · riemann.io

Alerts

Riemann can throttle or roll up events into email alerts and integrate with PagerDuty for SMS or phone alerts.Read 11 Oct 2026 · riemann.io

Client languages

The clients page lists libraries for C, C++, C#, Clojure, Elixir, Erlang, Go, Java, Lua, Node.js, OCaml, Perl, Python, Ruby, Rust, and Scala.Read 11 Oct 2026 · riemann.io

Client protocol

Clients use Protocol Buffers over TCP or UDP to submit events and query the index.Read 11 Oct 2026 · riemann.io

Configuration

Riemann configuration is a Clojure program that can be extended with custom functions.Read 11 Oct 2026 · riemann.io

Dashboard

Riemann-dash uses websockets to display interactive visualizations of the Riemann index.Read 11 Oct 2026 · riemann.io

Dashboards

The dashboard displays queried system state and can show matching events in real time over websockets.Read 4 Oct 2026 · riemann.io

Event data

Events can include host, service, state, time, description, tags, metric, TTL, and custom fields.Read 11 Oct 2026 · riemann.io

Event processing

Riemann filters, combines, and acts on event flows to help understand systems.Read 11 Oct 2026 · riemann.io

Limits

Riemann cannot automatically shard workloads, so users must choose sharding axes and build the aggregation and discovery mechanics.Read 11 Oct 2026 · riemann.io

Monitoring

Events can report application exceptions and request latency as well as host CPU, memory, and disk state.Read 4 Oct 2026 · riemann.io

Operational limit

The site notes that UDP is lossy and recommends TCP for reliable delivery and acknowledgement.Read 4 Oct 2026 · riemann.io

Performance

The site says a stock configuration on commodity x86 hardware can handle millions of events per second at sub-millisecond latency, with 99th-percentile latency around 5 ms.Read 4 Oct 2026 · riemann.io

Protocols

Riemann accepts Protocol Buffers over TCP and UDP; its documented servers also include TLS and websockets.Read 4 Oct 2026 · riemann.io

Speed

The maker says a stock configuration on commodity x86 hardware can handle millions of events per second at sub-millisecond latencies, with 99th percentile latency around 5 ms.Read 11 Oct 2026 · riemann.io

State index

Its index stores the latest event for each host and service, and removes entries when their TTL expires.Read 11 Oct 2026 · riemann.io

Stream processing

Its configurable streams can filter, combine, alter, and act on events, and the configuration is written in Clojure.Read 4 Oct 2026 · riemann.io

Where Specifiction places it

• Alert Management Software#25 of 367.4