How do you use the ensure plugin with a page_url metric?

[sebboh]

I have some metrics with page_urls in the name that I can't seem to get to work with the ensure plugin.

the metric generated looks like:

browser.page.FCP.https://example.com/my-url:
  min: ......................................................................... 427.9
  max: ......................................................................... 427.9
  mean: ........................................................................ 427.9
  median: ...................................................................... 424.2
  p95: ......................................................................... 424.2
  p99: ......................................................................... 424.2

plugin config:

plugins:
    ensure:
      thresholds:
        - 'browser.page.FCP.https://example.com/my-url': 1800

the threshold check fails with this error:

Error: Parse error on line 1:
...owser.page.FCP.https://example.com/my-ur
-----------------------^
Expecting 'EOF', '+', '-', '*', '/', '%', '^', 'and', 'or', 'not', '==', '!=', '~=', '<', '<=', '>', '>=', '?', 'in', got ':'
    at Parser.parseError (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/node_modules/artillery-plugin-ensure/node_modules/filtrex/dist/cjs/filtrex.js:1229:19)
    at Parser.parse (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/node_modules/artillery-plugin-ensure/node_modules/filtrex/dist/cjs/filtrex.js:1311:34)
    at compileExpression (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/node_modules/artillery-plugin-ensure/node_modules/filtrex/dist/cjs/filtrex.js:1815:23)
    at /Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/node_modules/artillery-plugin-ensure/index.js:139:17
    at Array.forEach (<anonymous>)
    at EnsurePlugin.runChecks (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/node_modules/artillery-plugin-ensure/index.js:127:25)
    at Object.method (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/node_modules/artillery-plugin-ensure/index.js:68:41)
    at gracefulShutdown (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/lib/cmds/run.js:383:15)
    at EventEmitter.<anonymous> (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/lib/cmds/run.js:314:13)
    at EventEmitter.emit (/Users/sebboh/.nvm/versions/node/v22.14.0/lib/node_modules/artillery/node_modules/eventemitter3/index.js:202:33)

I couldn't find anything in the documentation about this. My attempts at escaping the : character have not worked. Any ideas?

[manfromanotherland]

@sebboh did you had a look at the $rewriteMetricName hook? It might help you there!

Alternatively, try setting the metric with single quotes inside it like this, might be an issue with handling of special characters:

  plugins:
    ensure:
      thresholds:
        - "'browser.page.FCP.https://example.com/my-url'": 1800

Let me know if that works for you.

[sebboh]

@manfromanotherland ah yes, that's what I needed. thanks!