[FEATURE] Export simulator state as Prometheus metric

[Ka0o0]

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Description

Hi, it would be nice if the simulator would expose a metric endpoint that provides Prometheus scrapable metrics about the state of simulator. Some metrics I could think of are:

Overall

• Number of configured charge stations

Per Charge Station

• WebSocket Connection State
• State of the charge station (started/starting/...)
• Connector count

Per Connector

• Most data from ConnectorStatus

Is anything like this planned?

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[jerome-benoit]

The UI server already expose simulator state and charging stations details through the simulatorState and listChargingStations procedure. One can write a Prometheus exporter that will transform the output from these procedures to prometheus metrics syntax.