uWSGI Stats

Overview

A Datadog Agent check that reads the uWSGI stats server and ships the full metric set: global rollups, per-worker, and per-socket metrics, with auto-detected per-app / cache / spooler sections and an opt-in per-core mode. Cumulative counters are submitted as monotonic_count, so worker respawns do not corrupt rate graphs.

Setup

Install the packaged integration into the Datadog Agent's embedded Python. First enable the uWSGI stats server — --stats 127.0.0.1:1717 (TCP), --stats /path.sock (UNIX), or --stats-http 127.0.0.1:1717 (HTTP); whichever address you pick becomes the check's stats_url.

Quick install (recommended)

scripts/build-and-install.sh runs the whole build → install → configure flow (the manual steps below) as a single command:

./scripts/build-and-install.sh

Run it from an operator account that may sudo -u dd-agent. It needs no general root access: the wheel is built as you, then installed and configured as the Agent user. It stages the wheel through /tmp so dd-agent can read it (see step 2 for why), creates conf.d/uwsgi_stats.d/conf.yaml from the packaged example — an existing conf.yaml is never overwritten, so re-running the script to upgrade the check is safe — and prints the configure/verify/restart commands, including the single step that needs root (the Agent restart), at the end rather than performing them.

For a non-standard host, override the defaults via environment variables:

# e.g. an Agent that runs as 'datadog' with a non-PATH binary
DD_AGENT_USER=datadog DATADOG_AGENT=/opt/datadog-agent/bin/agent/agent \
  ./scripts/build-and-install.sh

./scripts/build-and-install.sh --help prints a summary of all of the above.

Manual install

The steps the script automates, if you would rather run them yourself or its assumptions don't fit your host:

1. Build the wheel (see Development for the dev environment):

   python -m build   # -> dist/datadog_uwsgi_stats-<version>-py3-none-any.whl
   

2. Install the wheel. datadog-agent integration install runs as the dd-agent user, which usually cannot read files under your home directory — so stage the wheel somewhere world-readable (e.g. /tmp) and pass an absolute path, not a dist/… path that resolves back into $HOME:

   cp dist/datadog_uwsgi_stats-*.whl /tmp/
   chmod 644 /tmp/datadog_uwsgi_stats-*.whl
   sudo -u dd-agent datadog-agent integration install -w /tmp/datadog_uwsgi_stats-*.whl
   

   This installs the check into the Agent's embedded Python and creates /etc/datadog-agent/conf.d/uwsgi_stats.d/, into which it copies the packaged conf.yaml.example. It does not activate the check and does not chown anything — the config dir is owned by whoever ran the command (dd-agent above, which is what you want).

3. Configure. Activate the copied template, set stats_url, and make sure the Agent user can read it:

   cd /etc/datadog-agent/conf.d/uwsgi_stats.d
   sudo -u dd-agent cp conf.yaml.example conf.yaml   # then edit conf.yaml: set stats_url
   sudo chown -R dd-agent:dd-agent /etc/datadog-agent/conf.d/uwsgi_stats.d
   sudo chmod 640 conf.yaml
   

4. Verify, then restart:

   sudo -u dd-agent datadog-agent check uwsgi_stats   # runs the check once, as the Agent user
   sudo systemctl restart datadog-agent               # or: datadog-agent reload
   

install -w skips the version/compatibility checks the registry (-t) path performs and cannot verify a local wheel — only install wheels you built or trust.

Data Collected

Metrics

See metadata.csv for the full list. All metrics are namespaced uwsgi.. Times are microseconds; sizes are bytes.

Service Checks

• uwsgi.can_connect - CRITICAL if the stats server is unreachable or returns invalid JSON, OK otherwise.
• uwsgi.worker_saturation - WARNING/CRITICAL as the socket listen queue fills (queue / max_queue) or all workers are busy with a growing listen queue.

Development

The check runs on the Agent's embedded Python (>=3.8), but the test toolchain (datadog-checks-dev) requires Python >=3.10 — use 3.11/3.12 for development.

python -m venv .venv
. .venv/bin/activate
pip install -e ".[dev]"

pytest                            # test suite
ruff check datadog_checks tests   # lint
mypy datadog_checks/uwsgi_stats   # type check
python -m build                   # build the wheel into dist/

CI (GitHub Actions) runs ruff, mypy, and pytest on Python 3.11 and 3.12, plus a 3.8 byte-compile job that guards the Agent-runtime floor.

Design

• Architecture map, invariants, and landmines: ARCHITECTURE.md
• Decision records: docs/adr/