Add get certificate by monitor ID to docs

Server/openapi.json

@@ -791,6 +791,59 @@
           }
         ]
       }
+    },
+    "/monitors/certificate/{monitorId}": {
+      "get": {
+        "tags": ["monitors"],
+        "description": "Get monitor certificate",
+        "parameters": [
+          {
+            "name": "monitorId",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/SuccessResponse"
+                }
+              }
+            }
+          },
+          "422": {
+            "description": "Unprocessable Content",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "Internal Server Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          }
+        },
+        "security": [
+          {
+            "bearerAuth": []
+          }
+        ]
+      }
     }
   },