feat: add document load under Frontend and Mobile Monitoring (#1023)

* feat: add document load under Frontend and Mobile Monitoring

* Addressed requested changes

constants/docsSideNav.ts

@@ -1019,6 +1019,11 @@ const docsSideNav = [
     className: 'new-doc',
     route: '/docs/frontend-and-mobile-monitoring',
     items: [
+      {
+        type: 'doc',
+        route: '/docs/frontend-monitoring/document-load',
+        label: 'Document Load',
+      },
       {
         type: 'doc',
         route: '/docs/frontend-monitoring/web-vitals',

data/docs/frontend-monitoring/document-load.mdx

@@ -0,0 +1,284 @@
+---
+date: 2024-12-04
+id: document-load
+title: Document Load
+hide_table_of_contents: true
+---
+
+## Overview
+
+This documentation explains how to auto-instrument your web application to collect document load data, visualize it as traces in SigNoz, and set useful alerts.
+
+Using OpenTelemetry to capture data on **document load** is useful because it allows you to monitor your application's key performance metrics. This data is essential for:
+
+1. **Page Load Sequence**: Traces give you insight into the sequence of operations during document load, helping identify slow resources or inefficient processes that may delay rendering.
+2.  **Content Delivery**: By understanding where delays occur (such as in external resource fetches or script execution), you can take specific actions to improve how content is delivered to users.
+3. **Slow Resources**: Trace data reveals third-party services or external APIs that may cause slowdowns, enabling decisions to cache, optimize, or delay the loading of those resources.
+4. **Proactive Monitoring**: Continuously tracking document load traces helps identify bottlenecks before they affect a large portion of users, allowing for preemptive performance tuning.
+5. **Latency Causes**: Pinpointing delays in content load allow for targeted optimizations, whether caused by large assets, server issues, or inefficient scripts.
+
+<Tabs entityName="plans">
+<TabItem value="cloud" label="SigNoz Cloud" default>
+
+## Prerequisites
+
+* A Web Application for capturing document load data
+
+## Setup
+
+### Step 1: Create an Instrumentation file
+
+In the `src` directory of your web application, create a new JavaScript file (e.g., `otel-setup.js`) and paste the code below. This code auto-instruments your application to capture and send document load events to your SigNoz Instance.
+
+```javascript:otel-setup.js
+import { WebTracerProvider } from '@opentelemetry/sdk-trace-web';
+import { DocumentLoadInstrumentation } from '@opentelemetry/instrumentation-document-load';
+import { registerInstrumentations } from '@opentelemetry/instrumentation';
+import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http';
+import { SimpleSpanProcessor } from '@opentelemetry/sdk-trace-base';
+import { Resource } from '@opentelemetry/resources';
+
+// Initialize the provider
+const provider = new WebTracerProvider({ resource: new Resource({ "service.name": "<service_name>" }) // Set the SigNoz Cloud collector URL
+
+// create an OTLP exporter configured to send trace data to your SigNoz Cloud
+const otlpExporter = new OTLPTraceExporter({
+  url: `https://ingest.<region>.signoz.cloud:443/v1/traces`,
+  headers: { 'signoz-access-token': "<your-ingestion-key>" });
+
+// Add the exporter to the span processor
+provider.addSpanProcessor(new SimpleSpanProcessor(otlpExporter));
+
+// Register the provider
+provider.register();
+
+// Register automatic instrumentation for document load
+registerInstrumentations({
+  instrumentations: [
+    new DocumentLoadInstrumentation()
+  ],
+});
+
+console.log('OpenTelemetry instrumentation initialized');
+```
+
+- Set the `<region>` to match your SigNoz Cloud [region](https://signoz.io/docs/ingestion/signoz-cloud/overview/#endpoint)
+- Replace `<your-ingestion-key>` with your SigNoz [ingestion key](https://signoz.io/docs/ingestion/signoz-cloud/keys/)
+- `<service_name>` is name of your service
+
+### Step 2: Send Telemetry data to SigNoz
+
+To send Telemetry data to SigNoz, import `otel-setup.js` into  `index.js` and save the changes.
+
+```javascript:index.js
+import './otel-setup'
+```
+
+### Step 3: Start the App
+
+Go to the root folder of your web application, and run the following command:
+
+```bash
+npm start
+```
+
+You will now see your application in the **Services** section in the SigNoz sidebar.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/document-load-services-section-image.webp" alt="SigNoz Services Interface"/>
+<figcaption><i>SigNoz Services Interface</i></figcaption>
+</figure>
+
+### Step 4: Document Load Trace Data
+
+The document load data is automatically captured in the **Traces** section of the SigNoz dashboard as soon as your application is loaded.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/document-load-traces-section.webp" alt="Trace Data on Document Load"/>
+<figcaption><i>Trace Data on Document Load</i></figcaption>
+</figure>
+
+## Setup Alerts
+
+### Create an Alert
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/resource-fetch-alert-sample.webp" alt="Resource Alert Fetch Sample"/>
+<figcaption><i>ResourceFetch Trace Alert Sample</i></figcaption>
+</figure>
+
+You can create **trace-based alerts** by using the `Create an Alert` button in the [Save View](https://signoz.io/docs/product-features/saved-view/) button at the bottom of **Traces** section.  Alternatively, you can directly create it from the **Alerts** section. To create and manage trace-based alerts, follow [this guide](https://signoz.io/docs/alerts-management/trace-based-alerts/).
+
+In this example, we will set up an alert for `ResourceFetch`. Resource Fetch reports all the resources, including external scripts, images, style sheets, fonts, and other assets, that are required to render a webpage. Knowing the time it takes to fetch resources will be useful in taking proactive action to optimize your application using caching or other optimization strategies.
+
+In the `Traces Based Alerts` page, set the `Traces` field to `service.name = <service_name>`  and `name = resourceFetch` . Next, set the `Y-axis units` to seconds. You can also set the `Legend Format` to `Resource Fetch`and then press the **Stage & Run Query** button.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/define-the-metric.webp" alt="Define the Metric"/>
+<figcaption><i>Set the Traces Field to filter ResourceFetch Data</i></figcaption>
+</figure>
+
+### Define Alert Condition
+
+Define an alert condition with **Send a notification when `A` is `above` the threshold `at least once` during the last `5 mins`** and set the  `Alert Threshold` field to `10 seconds`.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/alert-conditions.webp" alt="Set Alert Condition"/>
+<figcaption><i>Set the Alert Condition</i></figcaption>
+</figure>
+
+### Set Alert Configuration
+
+Set the `Severity` field to `critical`, the `Alert Name` field to `ResourceFetch`, toggle on the `Alert all the configured channels` field to alert all the notification channels. You can choose to send the alert to a particular notification channel by selecting a particular Notifcation Channel from the dropdown. Save the rule and test the notification.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/alert-configuration.webp" alt="Set Alert Configuration"/>
+<figcaption><i>Set the Alert Configuration</i></figcaption>
+</figure>
+
+With this, you have successfully set up a useful alerts on your data.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/alert-rules.webp" alt="Alert Rules"/>
+<figcaption><i>ResourceFetch Alert Rule is OK</i></figcaption>
+</figure>
+
+</TabItem>
+
+<TabItem value="self-host" label="Self-Host" default>
+
+## Prerequisites
+
+* A Web Application for capturing document load data
+
+## Setup
+
+### Step 1: Create an Instrumentation file
+
+In the `src` directory of your web application, create a new JavaScript file (e.g., `otel-setup.js`) and paste the code below. This code auto-instruments your application to capture and send document load events to your SigNoz Instance.
+
+```javascript
+import { WebTracerProvider } from '@opentelemetry/sdk-trace-web';
+import { DocumentLoadInstrumentation } from '@opentelemetry/instrumentation-document-load';
+import { registerInstrumentations } from '@opentelemetry/instrumentation';
+import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http';
+import { SimpleSpanProcessor } from '@opentelemetry/sdk-trace-base';
+import { Resource } from '@opentelemetry/resources';
+
+// Initialize the provider
+const provider = new WebTracerProvider({ resource: new Resource({ "service.name": "<service_name>" }) // Set the SigNoz Cloud collector URL
+
+// create an OTLP exporter configured to send trace data to your Self-Hosted SigNoz
+const otlpExporter = new OTLPTraceExporter({
+  url: '/v1/traces',
+  headers: {
+    'Content-Type': 'application/json',
+  },
+});
+
+// Add the exporter to the span processor
+provider.addSpanProcessor(new SimpleSpanProcessor(otlpExporter));
+
+// Register the provider
+provider.register();
+
+// Register automatic instrumentation for document load
+registerInstrumentations({
+  instrumentations: [
+    new DocumentLoadInstrumentation()
+  ],
+});
+
+console.log('OpenTelemetry instrumentation initialized');
+```
+
+- `<service_name>` is name of your service
+
+Set a proxy in your `package.json` pointing to to the SigNoz OTLP HTTP endpoint. This is an easier temporary setup to bypass CORS issues. You can use [this documentation](https://signoz.io/docs/userguide/otlp-http-enable-cors/) to guide you on dealing with CORS issues for a permanent setup.
+
+```bash
+{
+      "proxy": "http://localhost:4318"
+}
+```
+
+### Step 3: Send Telemetry data to SigNoz
+
+To send Telemetry data to SigNoz, import `otel-setup.js` into  `index.js` and save the changes.
+
+```javascript:index.js
+import './otel-setup'
+```
+
+### Step 4: Start the App
+
+Go to the root folder of your web application, and run the following command:
+
+```bash
+npm start
+```
+
+You will now see your application in the **Services** section in the SigNoz sidebar.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/document-load-services-section-image.webp" alt="SigNoz Services Interface"/>
+<figcaption><i>SigNoz Services Interface</i></figcaption>
+</figure>
+
+### Step 5: Document Load Trace Data
+
+The document load data is automatically captured in the **Traces** section of the SigNoz dashboard as soon as your application is loaded.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/document-load-traces-section.webp" alt="Trace Data on Document Load"/>
+<figcaption><i>Trace Data on Document Load</i></figcaption>
+</figure>
+
+## Setup Alerts
+
+### Create an Alert
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/resource-fetch-alert-sample.webp" alt="Resource Alert Fetch Sample"/>
+<figcaption><i>ResourceFetch Trace Alert Sample</i></figcaption>
+</figure>
+
+You can create **trace-based alerts** by using the `Create an Alert` button in the [Save View](https://signoz.io/docs/product-features/saved-view/) button at the bottom of **Traces** section.  Alternatively, you can directly create it from the **Alerts** section. To create and manage trace-based alerts, follow [this guide](https://signoz.io/docs/alerts-management/trace-based-alerts/).
+
+In this example, we will set up an alert for `ResourceFetch`. Resource Fetch reports all the resources, including external scripts, images, style sheets, fonts, and other assets, that are required to render a webpage. Knowing the time it takes to fetch resources will be useful in taking proactive action to optimize your application using caching or other optimization strategies.
+
+In the `Traces Based Alerts` page, set the `Traces` field to `service.name = <service_name>`  and `name = resourceFetch` . Next, set the `Y-axis units` to seconds. You can also set the `Legend Format` to `Resource Fetch`and then press the **Stage & Run Query** button.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/define-the-metric.webp" alt="Define the Metric"/>
+<figcaption><i>Set the Traces Field to filter ResourceFetch Data</i></figcaption>
+</figure>
+
+### Define Alert Condition
+
+Define an alert condition with **Send a notification when `A` is `above` the threshold `at least once` during the last `5 mins`** and set the  `Alert Threshold` field to `10 seconds`.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/alert-conditions.webp" alt="Set Alert Condition"/>
+<figcaption><i>Set the Alert Condition</i></figcaption>
+</figure>
+
+### Set Alert Configuration
+
+Set the `Severity` field to `critical`, the `Alert Name` field to `ResourceFetch`, toggle on the `Alert all the configured channels` field to alert all the notification channels. You can choose to send the alert to a particular notification channel by selecting a particular Notifcation Channel from the dropdown. Save the rule and test the notification.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/alert-configuration.webp" alt="Set Alert Configuration"/>
+<figcaption><i>Set the Alert Configuration</i></figcaption>
+</figure>
+
+With this, you have successfully set up a useful alerts on your data.
+
+<figure data-zoomable align='center'>
+<img className="box-shadowed-image" src="/img/docs/frontend-monitoring/alert-rules.webp" alt="Alert Rules"/>
+<figcaption><i>ResourceFetch Alert Rule is OK</i></figcaption>
+</figure>
+
+</TabItem>
+
+</Tabs>