Add external plugin sumo-logic (#3140)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.github/plugin/marketplace.json

@@ -1699,6 +1699,34 @@
       "description": "Premium planning, thrifty implementation",
       "version": "1.0.0"
     },
+    {
+      "name": "sumo-logic",
+      "description": "Query Sumo Logic logs, alerts, dashboards, and SIEM insights directly from Copilot.",
+      "version": "1.0.0",
+      "author": {
+        "name": "Sumo Logic",
+        "url": "https://www.sumologic.com"
+      },
+      "repository": "https://github.com/SumoLogic/sumologic-ai-plugins",
+      "homepage": "https://www.sumologic.com/help/docs/api/mcp-server/",
+      "license": "Apache-2.0",
+      "keywords": [
+        "sumo-logic",
+        "observability",
+        "logs",
+        "mcp",
+        "monitoring",
+        "alerts",
+        "copilot",
+        "siem"
+      ],
+      "source": {
+        "source": "github",
+        "repo": "SumoLogic/sumologic-ai-plugins",
+        "ref": "v1.0.0",
+        "sha": "804c0909c20cf3b247df3b5de60bb94f8b65c315"
+      }
+    },
     {
       "name": "swift-mcp-development",
       "source": "plugins/swift-mcp-development",