https://api.sekrd.com/monitor/YOUR_PROJECT_ID.js

1(function(){
2  var pid="YOUR_PROJECT_ID";
3  var ep="https://api.sekrd.com/api/v1/monitor/"+pid+"/events";
4  var q=[];
5  var T=null;
6  function flush(){
7    if(!q.length)return;
8    var batch=q.splice(0,q.length);
9    try{
10      var ok=navigator.sendBeacon(ep+"?batch=1",JSON.stringify(batch));
11      if(!ok)throw 0;
12    }catch(e){
13      try{fetch(ep+"?batch=1",{method:"POST",body:JSON.stringify(batch),keepalive:true})}catch(e2){}
14    }
15  }
16  function enq(t,p){q.push({event_type:t,payload:p});if(!T)T=setTimeout(function(){T=null;flush()},5000)}
17  try{document.addEventListener("visibilitychange",function(){if(document.visibilityState==="hidden")flush()})}catch(e){}
18  try{window.addEventListener("pagehide",flush)}catch(e){}
19  window.addEventListener("error",function(e){
20    enq("error",{message:e.message||"",filename:e.filename||"",lineno:e.lineno||0,colno:e.colno||0})
21  });
22  window.addEventListener("unhandledrejection",function(e){
23    enq("error",{message:String(e.reason||"unhandled rejection"),type:"unhandledrejection"})
24  });
25  if(window.PerformanceObserver){
26    try{
27      new PerformanceObserver(function(l){
28        l.getEntries().forEach(function(e){enq("vitals",{name:e.name,value:e.value})})
29      }).observe({type:"largest-contentful-paint",buffered:true});
30    }catch(e){}
31    try{
32      new PerformanceObserver(function(l){
33        l.getEntries().forEach(function(e){enq("vitals",{name:"CLS",value:e.value})})
34      }).observe({type:"layout-shift",buffered:true});
35    }catch(e){}
36    try{
37      new PerformanceObserver(function(l){
38        l.getEntries().forEach(function(e){enq("vitals",{name:"INP",value:e.duration})})
39      }).observe({type:"event",durationThreshold:16,buffered:true});
40    }catch(e){}
41  }
42  enq("pageview",{url:location.href,referrer:document.referrer});
43})();