Capture usage metrics in PostHog

[PabloCastellano]

• Add 'network' property to trpc_request event (sepolia, holesky)
• Include host in $current_url and check if $host is automatically set, otherwise:
  • Add '$host' property to trpc_request event (fix(posthog): send $host in trpc_request events #672)
  • Set pathname as $pathname
• Merge Fix PostHog frontend distinctId error #609
  Posthog:
• Configure "URL query parameter converter" https://posthog.com/docs/cdp/url-query
  • It is raising TypeError exceptions. Check if including host in $current_url fixes it!
• Add dashboards breaking down by network and $host

Host

TRPC requests can originate from the API or Web

The host is set always as if the request came from the API after the change introduced in commit 79f9151. Instead, we should try to set the host when the trpc context is created

Distinct ID for API requests

We don't require any API key so the only way so far is generating an UUID directly from the IP. We can use something like:

import { v5 as uuidv5 } from 'uuid';
import crypto from 'crypto';

const NAMESPACE = '6ba7b810-9dad-11d1-80b4-00c04fd430c8'; // UUID namespace

function generateUUIDFromIP(ip: string): string {
    const hash = crypto.createHash('sha256').update(ip).digest('hex');
    const uuid = uuidv5(hash, NAMESPACE);
    return uuid;
}

// Example usage
const ip = '192.168.1.1';
const uniqueUUID = generateUUIDFromIP(ip);
console.log(uniqueUUID);