rebranding herald => steep
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# Herald
![Steep — Let your code steep](banniere_readme.png)
Herald is a Gitea bot that performs automated AI-powered code reviews on pull requests using [OpenRouter](https://openrouter.ai/).
# Steep
*Let your code steep.*
Steep is a Gitea bot that performs automated AI-powered code reviews on pull requests using [OpenRouter](https://openrouter.ai/).
## Features
@@ -10,18 +14,18 @@ Herald is a Gitea bot that performs automated AI-powered code reviews on pull re
- Graceful shutdown — in-progress reviews finish before the process exits
- Error tracking via Sentry
- Prometheus metrics endpoint for monitoring
- Tiny memory footprint (~4MB) thanks to Rust
- Lightweight, performant Rust service with Prometheus metrics and Sentry error tracking
## Installation
**Requirements:** Rust toolchain ([rustup.rs](https://rustup.rs))
```sh
cargo build --release
./target/release/herald
cargo build --release -p steep-server
./target/release/steep-server
```
Herald reads its configuration from environment variables (a `.env` file is supported):
Steep reads its configuration from environment variables (a `.env` file is supported):
| Variable | Description |
|---|---|
@@ -38,11 +42,11 @@ Herald reads its configuration from environment variables (a `.env` file is supp
| `SENTRY_DSN` | *(optional)* Sentry DSN for error tracking |
| `RUST_LOG` | *(optional)* Log level, defaults to `info` |
| `SANDBOX_MAX_ITERATIONS` | *(optional)* Maximum number of tool-calling iterations per sandboxed review. Defaults to `8` |
| `DOCKER_HOST` | *(optional)* Container daemon socket Herald drives, e.g. `unix:///run/user/1000/podman/podman.sock` for a rootless podman. Defaults to `unix:///var/run/docker.sock` |
| `DOCKER_HOST` | *(optional)* Container daemon socket Steep drives, e.g. `unix:///run/user/1000/podman/podman.sock` for a rootless podman. Defaults to `unix:///var/run/docker.sock` |
## Sandboxed reviews
Herald reviews pull requests inside an ephemeral
Steep reviews pull requests inside an ephemeral
[Dev Container](https://containers.dev/). For each review it:
1. clones the pull request head into a temporary directory,
@@ -66,14 +70,14 @@ Each comment is tagged with a severity — `bug`, `security`, `performance` or
`maintainability` — shown at the start of the comment, and the summary also lists
what the pull request does well.
Herald drives the container daemon through its socket: `DOCKER_HOST` (default
Steep drives the container daemon through its socket: `DOCKER_HOST` (default
`unix:///var/run/docker.sock`), which covers both docker and podman's
Docker-compatible socket. When the repository contains a
`.devcontainer/devcontainer.json` (or `.devcontainer.json`), Herald uses it;
`.devcontainer/devcontainer.json` (or `.devcontainer.json`), Steep uses it;
otherwise it falls back to a default devcontainer that pulls `debian:stable-slim`
and runs the review in `/workspace`.
Herald can therefore run inside a container with only that socket mounted (no
Steep can therefore run inside a container with only that socket mounted (no
shared workspace directory is required): the clone is streamed to the daemon over
the socket, like the build context, instead of being bind-mounted from a host
path the daemon would have to see. This is the setup the `Containerfile`
@@ -82,7 +86,7 @@ produces, e.g.:
```sh
podman run --env-file=.env -p 3001:3001 \
-v /run/user/$(id -u)/podman/podman.sock:/var/run/docker.sock \
herald:latest
steep:latest
```
The `runArgs` of that file are ignored: they come from an untrusted pull request,
@@ -107,28 +111,28 @@ Open the project and reopen it in the container — the Rust toolchain is pre-in
```sh
rustup toolchain install stable
cargo run
cargo run -p steep-server
```
Copy `.env.example` to `.env` and fill in your values before running.
## Metrics
Herald optionally exposes a Prometheus metrics endpoint, useful for scraping with an [OpenTelemetry Collector](https://opentelemetry.io/docs/collector/) or any Prometheus-compatible scraper.
Steep optionally exposes a Prometheus metrics endpoint, useful for scraping with an [OpenTelemetry Collector](https://opentelemetry.io/docs/collector/) or any Prometheus-compatible scraper.
Set `METRICS_BIND_ADDR` (e.g. `0.0.0.0:9100`) to enable it. The metrics are then available at `http://<host>:9100/metrics`.
Set `METRICS_BIND_ADDR` (e.g. `0.0.0.0:9100`) to enable it. The metrics are then available at `http://<host>:9100/metrics`. The metric namespace changed from `herald_*` to `steep_*`; update any dashboards or alerts that use the old names.
### Exposed metrics
| Metric | Type | Description |
|---|---|---|
| `herald_webhooks_received_total` | counter | Total webhooks received (label: `event_type`) |
| `herald_webhooks_duplicate_total` | counter | Webhooks rejected as duplicates (label: `event_type`) |
| `herald_webhooks_channel_full_total` | counter | Webhooks dropped because the bot channel was full (label: `event_type`) |
| `herald_bot_tasks_active` | gauge | Bot tasks currently in progress |
| `herald_bot_tasks_completed_total` | counter | Bot tasks completed successfully (label: `event_type`) |
| `herald_bot_tasks_failed_total` | counter | Bot tasks that failed (label: `event_type`) |
| `herald_openrouter_cost_cents_total` | counter | Total OpenRouter cost in cents (divide by 100 for USD) |
| `steep_webhooks_received_total` | counter | Total webhooks received (label: `event_type`) |
| `steep_webhooks_duplicate_total` | counter | Webhooks rejected as duplicates (label: `event_type`) |
| `steep_webhooks_channel_full_total` | counter | Webhooks dropped because the bot channel was full (label: `event_type`) |
| `steep_bot_tasks_active` | gauge | Bot tasks currently in progress |
| `steep_bot_tasks_completed_total` | counter | Bot tasks completed successfully (label: `event_type`) |
| `steep_bot_tasks_failed_total` | counter | Bot tasks that failed (label: `event_type`) |
| `steep_openrouter_cost_cents_total` | counter | Total OpenRouter cost in cents (divide by 100 for USD) |
### OTel collector example
@@ -137,10 +141,10 @@ receivers:
prometheus:
config:
scrape_configs:
- job_name: herald
- job_name: steep
scrape_interval: 15s
static_configs:
- targets: ["herald:9100"]
- targets: ["steep:9100"]
service:
pipelines: