docs: Add Langtrace to observability tools (#726)

Co-authored-by: Yi Ding <yi.s.ding@gmail.com>

apps/docs/docs/observability/index.md

@@ -14,6 +14,9 @@ Configure a variable once, and you'll be able to do things like the following:
 
 Each provider has similarities and differences. Take a look below for the full set of guides for each one!
 
+- [OpenLLMetry](#openllmetry)
+- [Langtrace](#langtrace)
+
 ## OpenLLMetry
 
 [OpenLLMetry](https://github.com/traceloop/openllmetry-js) is an open-source project based on OpenTelemetry for tracing and monitoring
@@ -33,3 +36,29 @@ traceloop.initialize({
   disableBatch: true,
 });
 ```
+
+## Langtrace
+
+Enhance your observability with Langtrace, a robust open-source tool supports OpenTelemetry and is designed to trace, evaluate, and manage LLM applications seamlessly. Langtrace integrates directly with LlamaIndex, offering detailed, real-time insights into performance metrics such as accuracy, evaluations, and latency.
+
+#### Install
+
+- Self-host or sign-up and generate an API key using [Langtrace](https://www.langtrace.ai) Cloud
+
+```bash
+npm install @langtrase/typescript-sdk
+```
+
+#### Initialize
+
+```js
+import * as Langtrace from "@langtrase/typescript-sdk";
+Langtrace.init({ api_key: "<YOUR_API_KEY>" });
+```
+
+Features:
+
+- OpenTelemetry compliant, ensuring broad compatibility with observability platforms.
+- Provides comprehensive logs and detailed traces of all components.
+- Real-time monitoring of accuracy, evaluations, usage, costs, and latency.
+- For more configuration options and details, visit [Langtrace Docs](https://docs.langtrace.ai/introduction).

package.json

@@ -20,12 +20,12 @@
   },
   "devDependencies": {
     "@changesets/cli": "^2.27.1",
+    "@typescript-eslint/eslint-plugin": "^7.7.0",
     "eslint": "^8.57.0",
     "eslint-config-next": "^13.5.6",
     "eslint-config-prettier": "^8.10.0",
-    "eslint-config-turbo": "^1.11.3",
+    "eslint-config-turbo": "^1.13.2",
     "eslint-plugin-react": "7.28.0",
-    "@typescript-eslint/eslint-plugin": "^7.5.0",
     "husky": "^9.0.11",
     "lint-staged": "^15.2.2",
     "prettier": "^3.2.5",
@@ -33,7 +33,7 @@
     "turbo": "^1.13.2",
     "typescript": "^5.4.5"
   },
-  "packageManager": "pnpm@8.15.6+sha256.01c01eeb990e379b31ef19c03e9d06a14afa5250b82e81303f88721c99ff2e6f",
+  "packageManager": "pnpm@9.0.1+sha256.46d50ee2afecb42b185ebbd662dc7bdd52ef5be56bf035bb615cab81a75345df",
   "pnpm": {
     "overrides": {
       "trim": "1.0.1",