How to create an alert to notify an user when some amount % of threshold reached DailyAsyncApex Executions - asynchronous

Question

On 2 occasions in the past month, we have managed to hit our daily limit on asynchronous apex executions. Salesforce temporarily increased our limit to 425000 but it will be scaled down to 250000 in a week's time. Once we reach the limit, a lot of the SF functions will fail and this has tremendously impacted both internal staff and external customers.
So to prevent this from happening in the future, we need to create some kind of alert in Salesforce to monitor our daily asynchronous apex method executions. Our maximum daily limit is 250000. The alert will need to create a P3 helpdesk ticket and notify couple of users say USER A and USER B once it reaches 70% threshold.
Kindly advise what is possible to achieve the same
Thanks & Regards,
Harjeet

Answer 1

There's a promising Limits method but it doesn't seem to work currently ("reserved for future use"): System.debug(Limits.getAsyncCalls() + ' / ' + Limits.getLimitAsyncCalls());
There's an idea you can upvote: https://success.salesforce.com/ideaView?id=0873A0000003VIFQA2 ;)
You could query SELECT COUNT() FROM AsyncApexJob WHERE ... but that sounds like a bad idea ;)
I think your best course of action is to use SF REST API. There's a "limits" resource you can fetch. You could do it from SF itself (bad idea because if you'd schedule it to run every hour then well, of course it will contribute to the limit consumption too ;)) or from some external app that'd connect to your SF...
https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/dome_limits.htm
You can quickly try it out for example in workbench.developerforce.com before you decide you do want to deep dive into coding it.
Of course if you have control over your batch jobs, queuable, schedulable & #future calls you could implement some rough counter of executions in a helper object for example... won't help you much if most of the jobs are coming from managed packages though...
Got 1 more idea but it's pretty hardcore - you should be able to make a REST API call from javascript. so you could create a simple VF page (even without any apex controller), put JS callout on it, have it check every 5 mins and do something if threshold is hit... But that means IT person would have to have this page open all the time (perhaps as a home page component)... Messy :)

Answer 2

I was having the exact same issue so I created a simple JsForce script in NodeJS to monitor the call to the /limits endpoint.
You can connect a Free Monitoring service like UpTimerobot.com or PingDom.com and get an email when you find the Word "Warning" >50% or "Error" > 80%.
async function getSfLimits() {
try {
//Let's login into salesforce
const login = await conn.login(SF_USERNAME, SF_PASSWORD+SF_SECURITY_TOKEN);
//Call the API
const sfLimits = await conn.requestGet('/services/data/v51.0/limits');
return sfLimits;
} catch(err) {
console.log(err);
}
}
https://github.com/carlosdevia/salesforcelimits