diff --git a/PR_EVIDENCE.md b/PR_EVIDENCE.md
new file mode 100644
index 000000000..6568db397
--- /dev/null
+++ b/PR_EVIDENCE.md
@@ -0,0 +1,123 @@
+# Fix Evidence: diagnostics-otel OpenTelemetry v2.x Compatibility
+
+## Problem
+
+The `diagnostics-otel` plugin fails to start due to API breaking changes in OpenTelemetry v2.x packages.
+
+## Errors Before Fix
+
+### Error 1: Resource constructor
+```
+[plugins] plugin service failed (diagnostics-otel): TypeError: _resources.Resource is not a constructor
+```
+
+**Root cause:** `@opentelemetry/resources@2.5.0` no longer exports `Resource` class.
+
+### Error 2: addLogRecordProcessor method
+```
+[plugins] plugin service failed (diagnostics-otel): TypeError: logProvider.addLogRecordProcessor is not a function
+```
+
+**Root cause:** `@opentelemetry/sdk-logs@0.211.0` changed LoggerProvider API.
+
+## Changes Made
+
+### 1. Resource Creation (line 6, 65-67)
+**Before:**
+```typescript
+import { Resource } from "@opentelemetry/resources";
+// ...
+const resource = new Resource({
+  [SemanticResourceAttributes.SERVICE_NAME]: serviceName,
+});
+```
+
+**After:**
+```typescript
+import { resourceFromAttributes } from "@opentelemetry/resources";
+// ...
+const resource = resourceFromAttributes({
+  [ATTR_SERVICE_NAME]: serviceName,
+});
+```
+
+### 2. Semantic Conventions (line 11)
+**Before:**
+```typescript
+import { SemanticResourceAttributes } from "@opentelemetry/semantic-conventions";
+```
+
+**After:**
+```typescript
+import { ATTR_SERVICE_NAME } from "@opentelemetry/semantic-conventions";
+```
+
+### 3. LoggerProvider Processors (line 202-210)
+**Before:**
+```typescript
+logProvider = new LoggerProvider({ resource });
+logProvider.addLogRecordProcessor(
+  new BatchLogRecordProcessor(logExporter, { ... }),
+);
+```
+
+**After:**
+```typescript
+const logProcessor = new BatchLogRecordProcessor(logExporter, { ... });
+logProvider = new LoggerProvider({
+  resource,
+  processors: [logProcessor],
+});
+```
+
+## Testing
+
+### Environment
+- **OS:** Linux (WSL2)
+- **Node:** v22.22.0
+- **Docker:** moltbot:local image
+
+### Test Results
+
+**Before fix:**
+```
+[plugins] plugin service failed (diagnostics-otel): TypeError: _resources.Resource is not a constructor
+[plugins] plugin service failed (diagnostics-otel): TypeError: logProvider.addLogRecordProcessor is not a function
+```
+
+**After fix:**
+```
+[plugins] diagnostics-otel: logs exporter enabled (OTLP/HTTP)
+```
+
+✅ Plugin loads successfully
+✅ Logs exporter enabled
+✅ No errors in gateway startup
+✅ Telemetry pipeline ready
+
+### Validation Commands
+```bash
+# Build
+pnpm build  # ✅ No TypeScript errors
+
+# Lint
+npm run lint  # ✅ 0 warnings, 0 errors
+
+# Runtime test
+docker logs moltbot-moltbot-gateway-1 | grep diagnostic
+# Output: "diagnostics-otel: logs exporter enabled (OTLP/HTTP)"
+```
+
+## References
+
+- OpenTelemetry JS v2.0 migration guide: https://github.com/open-telemetry/opentelemetry-js/blob/main/doc/upgrade-to-2.x.md
+- Issue #3201: diagnostics-otel plugin fails: Resource is not a constructor
+- Related PR #2574: Partial fix (only addresses Resource, not LoggerProvider)
+
+## AI Disclosure
+
+This fix was developed with AI assistance (Claude Sonnet 4.5) and has been:
+- ✅ Fully tested locally
+- ✅ Validated with linter
+- ✅ Verified in production-like environment (Docker)
+- ✅ Understood by contributor (architectural reasoning documented)
diff --git a/extensions/diagnostics-otel/src/service.ts b/extensions/diagnostics-otel/src/service.ts
index 15c33fcb7..a8c669807 100644
--- a/extensions/diagnostics-otel/src/service.ts
+++ b/extensions/diagnostics-otel/src/service.ts
@@ -3,12 +3,12 @@ import type { SeverityNumber } from "@opentelemetry/api-logs";
 import { OTLPLogExporter } from "@opentelemetry/exporter-logs-otlp-http";
 import { OTLPMetricExporter } from "@opentelemetry/exporter-metrics-otlp-http";
 import { OTLPTraceExporter } from "@opentelemetry/exporter-trace-otlp-http";
-import { Resource } from "@opentelemetry/resources";
+import { resourceFromAttributes } from "@opentelemetry/resources";
 import { BatchLogRecordProcessor, LoggerProvider } from "@opentelemetry/sdk-logs";
 import { PeriodicExportingMetricReader } from "@opentelemetry/sdk-metrics";
 import { NodeSDK } from "@opentelemetry/sdk-node";
 import { ParentBasedSampler, TraceIdRatioBasedSampler } from "@opentelemetry/sdk-trace-base";
-import { SemanticResourceAttributes } from "@opentelemetry/semantic-conventions";
+import { ATTR_SERVICE_NAME } from "@opentelemetry/semantic-conventions";
 
 import type { DiagnosticEventPayload, OpenClawPluginService } from "openclaw/plugin-sdk";
 import { onDiagnosticEvent, registerLogTransport } from "openclaw/plugin-sdk";
@@ -62,8 +62,8 @@ export function createDiagnosticsOtelService(): OpenClawPluginService {
       const logsEnabled = otel.logs === true;
       if (!tracesEnabled && !metricsEnabled && !logsEnabled) return;
 
-      const resource = new Resource({
-        [SemanticResourceAttributes.SERVICE_NAME]: serviceName,
+      const resource = resourceFromAttributes({
+        [ATTR_SERVICE_NAME]: serviceName,
       });
 
       const traceUrl = resolveOtelUrl(endpoint, "v1/traces");
@@ -199,14 +199,15 @@ export function createDiagnosticsOtelService(): OpenClawPluginService {
           ...(logUrl ? { url: logUrl } : {}),
           ...(headers ? { headers } : {}),
         });
-        logProvider = new LoggerProvider({ resource });
-        logProvider.addLogRecordProcessor(
-          new BatchLogRecordProcessor(logExporter, {
-            ...(typeof otel.flushIntervalMs === "number"
-              ? { scheduledDelayMillis: Math.max(1000, otel.flushIntervalMs) }
-              : {}),
-          }),
-        );
+        const logProcessor = new BatchLogRecordProcessor(logExporter, {
+          ...(typeof otel.flushIntervalMs === "number"
+            ? { scheduledDelayMillis: Math.max(1000, otel.flushIntervalMs) }
+            : {}),
+        });
+        logProvider = new LoggerProvider({
+          resource,
+          processors: [logProcessor],
+        });
         const otelLogger = logProvider.getLogger("openclaw");
 
         stopLogTransport = registerLogTransport((logObj) => {