Chart renderer

A stateless microservice that renders charts as SVGs with Apache eCharts, used by mw:Extension:Chart

Production

Deployments

To deploy: Kubernetes/Deployments using the helmfile.d/services/chart-renderer subtree of deployment-charts repo.

Logging

ECS logs emitted to Logstash: https://logstash.wikimedia.org/goto/4f3d66af7f177fc3ed5330a0e4531af5

Metrics

https://grafana.wikimedia.org/d/f10cba3c-086c-49b2-bb04-65d70b39969a/charts-high-level?orgId=1

and

https://grafana.wikimedia.org/d/a8d73414-80d1-4965-9346-170eecaa04d6/chart-renderer-service?orgId=1

Alerting

Defined in the Puppet service catalog, a simple blackbox probe against /_info:

  chart-renderer:
    description: Stateless microservice that renders charts as SVGs with Apache eCharts, used by https://www.mediawiki.org/wiki/Extension:Chart
    encryption: true
    ip: *k8s-ingress-wikikube_ips
    page: true
    probes:
      - type: http
        path: /_info
        timeout: 10s

Beta

Instance details

Instance * 2 cores, 4 GB ram
Security group - allow port 6284

The instance has docker installed with role::beta::docker_services

Instance configuration needs to be done in horizon. Changes are recorded (read-only) in the cloud/instance-puppet gerrit repo:

https://gerrit.wikimedia.org/r/plugins/gitiles/cloud/instance-puppet/+/refs/heads/master/deployment-prep

Access

To access the instance

ssh deployment-docker-charts01.deployment-prep.eqiad1.wikimedia.cloud

Service health

To check health of the service:

curl 'http://0.0.0.0:6284/healthz'

From other instances in deployment-prep:

curl 'http://deployment-docker-charts01.deployment-prep.eqiad1.wikimedia.cloud:6284/healthz'

Check if the container is running:

sudo docker ps

Troubleshooting

sudo journalctl --unit=mediawiki-services-chart-renderer | tail -n 1000

sudo docker run -it --entrypoint /bin/bash docker-registry.wikimedia.org/repos/mediawiki/services/chart-renderer:latest