Grafana error: Cannot read properties of undefined (reading '0')

[taitruong]

Hi I have:

• setup Grafana as stated here: https://hermes.informal.systems/tutorials/production/setup-grafana.html
• started hermes locally (had to disable REST endpoint, since port 3000 is used by Grafana)

Now Grafana shows hermes log, but everything else (wallat balances, current numbers of workers, ...) is not showing ("No data"). Instead in console I see this error:

react_devtools_backend.js:2655 TypeError: Cannot read properties of undefined (reading '0')
    at BarChartPanel.tsx:102:21
    at Object.useMemo (react-dom.production.min.js:172:115)

It seems like it is not possible to collect the metrics - though I have enabled metrics in config.toml on port 3001.

What I also see in prometheus.yml is this scrape config: https://hermes.informal.systems/assets/prometheus.yaml

scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: "hermes"

    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
      - targets: ["host.docker.internal:3001"]

I wonder what host.docker.internal:3001 is? Should this point to metrics URL (localhost:3001)?

[ljoss17]

Hi @taitruong could you do the following:

• Specify which Hermes version you are using, you can get the version with the command hermes version. The version should also be outputted in one of the first lines of Hermes logs when you start the Hermes instance.
• Give the complete config.toml you are using.
• Try to manually refresh Grafana using the button next to the refresh timer, it should be in the upper right corner.
• Go to http://localhost:3001/metrics and confirm that you can see the metrics there.
• Post any ERROR log you see from Hermes