Vero Monitor Service

Description

The http_check probe sends an HTTP request to an endpoint and validates the response. Supports assertions on status code, body content, and JSONPath. This is an active check — emits metrics and a check result with latency.

Config fields

Field	Type	Required	Default	Description
`type`	`string`	Yes	—	Must be `"http_check"`
`url`	`string`	Yes	—	Full URL to check (including scheme)
`method`	`string`	No	`"GET"`	HTTP method
`headers`	`map[string]string`	No	—	Request headers
`bodyTemplate`	`string`	No	—	Request body (for POST/PUT)
`expectedStatus`	`int[]`	No	any < 400	Acceptable status codes. Empty = any status < 400 passes
`expectedBodyContains`	`string`	No	—	String that must appear in the response body
`expectedJsonPath`	`string`	No	—	JSONPath expression to check (e.g. `$.status`)
`expectedJsonValue`	`any`	No	—	Expected value at the JSONPath. If omitted, only checks path existence

Metrics

Metric	Type	Unit	Description
`vms.http_check.status`	status	—	`up` or `down`
`vms.http_check.latency_ms`	gauge	ms	Response time

Example config

{
  "type": "http_check",
  "method": "GET",
  "url": "https://app.verolabs.co/health",
  "expectedStatus": [200]
}

JSONPath assertion:

{
  "type": "http_check",
  "method": "GET",
  "url": "https://api.verolabs.co/status",
  "headers": { "Authorization": "Bearer token123" },
  "expectedJsonPath": "$.status",
  "expectedJsonValue": "healthy"
}

Notes

Assertions are evaluated in order: status code → body contains → JSONPath.
Response body is read up to 1 MiB.
A transport failure (connection refused, timeout) is a normal down result, not an agent error.