Add documentation for CERTIFICATE_EXPIRATION placeholder
@@ -162,12 +162,13 @@ Here are some examples of conditions you can use:
#### Placeholders
| Placeholder | Description | Example of resolved value |
-|:----------------------- |:------------------------------------------------------- |:------------------------- |
+|:-------------------------- |:--------------------------------------------------------------- |:------------------------- |
| `[STATUS]` | Resolves into the HTTP status of the request | 404
| `[RESPONSE_TIME]` | Resolves into the response time the request took, in ms | 10
| `[IP]` | Resolves into the IP of the target host | 192.168.0.232
| `[BODY]` | Resolves into the response body. Supports JSONPath. | `{"name":"john.doe"}`
| `[CONNECTED]` | Resolves into whether a connection could be established | `true`
+| `[CERTIFICATE_EXPIRATION]` | Resolves into the duration before certificate expiration, in ms | 4461677039, 0 (if not using HTTPS)
#### Functions
