💅 How to format healthcheck outputs to make them pretty?

[mountainash]

When running a “managed” Postgres app, the healthchecks (mulitple) return in the WebUI extra data which can be helpful and also is formatted nicely (well nicer than my own service healthchecks).

I was wondering if there’s a format (XML, JSON, etc) that my own Apps’ healthcheck endpoint could return to trigger this formatting in the Fly.io WebUI?

[mayailurus]

Hi… This is an interesting question. It is nice, but I don’t think there actually is a special markup format at work:

$ fly ssh console -a 03-02-pounce-api-db
# curl 'http://localhost:5500/flycheck/pg' && echo
[✓] connections: 11 used, 3 reserved, 300 max (5.73ms)
[✓] cluster-locks: No active locks detected (81.66µs)
[✓] disk-capacity: 12.3% - readonly mode will be enabled at 90.0% (16.48µs)

The checkmarks are just the Unicode character “✓” (U+2713), from the Dingbats block.

Here is a handful of my own favorites, for similar contexts…

character	codepoint (hex)	possible meaning
♥	U+2665	healthy
♡	U+2661	mostly ready, but still things starting up
◌	U+25cc	something is missing, which is odd but not strictly an error
☈	U+2608	trouble (lightning)

---

And each line in the table in your screenshot corresponds to a separate URL path that gets queried periodically:

$ fly config show -a 03-02-pounce-api-db

  "checks": {
    "pg": {
      "port": 5500,
      "type": "http",
      "interval": "15s",
      "timeout": "10s",
      "path": "/flycheck/pg"
    },
    "role": {
      "port": 5500,
      "type": "http",
      "interval": "15s",
      "timeout": "10s",
      "path": "/flycheck/role"
    },
    "vm": {
      "port": 5500,
      "type": "http",
      "interval": "15s",
      "timeout": "10s",
      "path": "/flycheck/vm"
    }
  }

Hope this helps a little!

[mountainash]

@mayailurus

Hope this helps a little!

Helps a lot!!! Thank you very much for all the info. I look forward to implementing some extra (multiple) healthcheck endpoints now.