Add CoraLogix billing plugin

manifest

@@ -3,3 +3,4 @@
 datadog
 mongodb-atlas
 openai
+coralogix

pkg/plugins/coralogix/README.md

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+# CoraLogix OpenCost Plugin
+
+The CoraLogix plugin imports CoraLogix Data Usage Service metrics into OpenCost Custom Costs.
+
+It uses the CoraLogix management API:
+
+```text
+GET /mgmt/openapi/latest/dataplans/data-usage/v2
+```
+
+The API requires the `Authorization` header with a CoraLogix API key. CoraLogix documents the Data Usage Service response as `entries` with `dimensions`, `sizeGb`, `timestamp`, and `units`; the service overview also notes that data usage endpoints can return newline-delimited JSON streams and should be requested with `Accept: text/event-stream`.
+
+## Configuration
+
+Create a plugin config JSON file:
+
+```json
+{
+  "coralogix_api_key": "<coralogix-api-key>",
+  "size_gb_unit_price": 0,
+  "unit_price": 0,
+  "log_level": "info"
+}
+```
+
+Optional fields:
+
+```json
+{
+  "api_base_url": "https://api.coralogix.com/mgmt/openapi/latest",
+  "date_range_style": "form",
+  "resolution": "",
+  "aggregate_by": [
+    "AGGREGATE_BY_APPLICATION",
+    "AGGREGATE_BY_SUBSYSTEM",
+    "AGGREGATE_BY_PILLAR"
+  ],
+  "metric_prices": {
+    "gb_sent": 0,
+    "unit_consumption": 0
+  },
+  "currency": "USD"
+}
+```
+
+CoraLogix actual pricing depends on the customer's plan. Configure `size_gb_unit_price`, `unit_price`, or `metric_prices` to convert usage into cost. When prices are left at zero, the plugin still reports usage quantities with zero billed cost.
+
+`api_base_url` can be changed for other CoraLogix regions. Official v5 server examples include:
+
+- `https://api.coralogix.com/mgmt/openapi/5`
+- `https://api.eu2.coralogix.com/mgmt/openapi/5`
+- `https://api.coralogix.us/mgmt/openapi/5`
+- `https://api.cx498.coralogix.com/mgmt/openapi/5`
+- `https://api.coralogix.in/mgmt/openapi/5`
+- `https://api.coralogixsg.com/mgmt/openapi/5`
+- `https://api.ap3.coralogix.com/mgmt/openapi/5`
+
+`date_range_style` defaults to `form`, which follows OpenAPI query-object defaults by sending `fromDate` and `toDate`. If a CoraLogix deployment expects a different object encoding, supported values are `deep_object`, `dotted`, and `json`.
+
+## Cost Mapping
+
+- `sizeGb` -> a `gb_sent` Custom Cost row with usage unit `GB`
+- `units` -> a `unit_consumption` Custom Cost row with usage unit `unit`
+- configured metric price multiplied by usage quantity -> billed and list cost
+- `application` and `subsystem` dimensions -> account and resource names
+- `pillar`, `entity_type`, `dataset`, and `dataspace` dimensions -> resource classification
+- CoraLogix dimensions -> Custom Cost descriptions and stable provider IDs
+
+Only daily resolution is supported. The plugin requests one Data Usage Service range per daily OpenCost window.