[SCHEMA] The MetricExporter schema is unsafe (#110)

---------

Co-authored-by: jack-berg <34418638+jack-berg@users.noreply.github.com>

Author: marcalff

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 * Adding initial instrumentation configuration schema
+* Split MetricExporter into PullMetricExporter and PushMetricExporter and ensure only PushMetricExporters can be associated with PeriodicMetricReader [#110](https://github.com/open-telemetry/opentelemetry-configuration/pull/110)
 
 ## [v0.2.0] - 2024-05-08
 

schema/meter_provider.json

@@ -32,7 +32,7 @@
                     "minimum": 0
                 },
                 "exporter": {
-                    "$ref": "#/$defs/MetricExporter"
+                    "$ref": "#/$defs/PushMetricExporter"
                 }
             },
             "required": [
@@ -45,15 +45,15 @@
             "additionalProperties": false,
             "properties": {
                 "exporter": {
-                    "$ref": "#/$defs/MetricExporter"
+                    "$ref": "#/$defs/PullMetricExporter"
                 }
             },
             "required": [
                 "exporter"
             ],
             "title": "PullMetricReader"
         },
-        "MetricExporter": {
+        "PushMetricExporter": {
             "type": ["object", "null"],
             "additionalProperties": true,
             "minProperties": 1,
@@ -64,7 +64,20 @@
                 },
                 "console": {
                     "$ref": "common.json#/$defs/Console"
-                },
+                }
+            },
+            "patternProperties": {
+                ".*": {
+                    "type": ["object", "null"]
+                }
+            }
+        },
+        "PullMetricExporter": {
+            "type": ["object", "null"],
+            "additionalProperties": true,
+            "minProperties": 1,
+            "maxProperties": 1,
+            "properties": {
                 "prometheus": {
                     "$ref": "#/$defs/Prometheus"
                 }