The OpenTelemetry Demo system is experiencing multiple cascading failures across several microservices. The issues appear to have started around 2025-05-27T00:06:00Z when the system was deployed or restarted. The primary symptoms include load generator errors, service connectivity issues, and potential performance degradation across multiple services.
During the past 24 hours, several incidents were detected in the OpenTelemetry Demo application. Analysis of telemetry data reveals three primary incidents:
- Product Catalog Service Failures: Feature flag-induced errors in the product-catalog service
- Load Generator Connection Issues: Multiple errors in the load-generator service, including export failures and browser context errors
- Performance Degradation: Significant latency spikes detected across multiple services
import { Console } from "node:console"; | |
const BALL = '⏺' | |
const COLOR = { | |
'blue': '\\033[94m', | |
'yellow': '\\033[93m', | |
'cyan': '\\033[96m', | |
'green': '\\033[92m', | |
'magenta': '\\033[95m', | |
'white': '\\033[97m', |
const div = document.createElement('div') | |
const input = document.createElement('input') | |
input.setAttribute('type', 'text') | |
input.addEventListener('change', (e) => { | |
if (text === '') { | |
return updateDiv({ text, className: 'hidden'}) | |
} | |
One of the big leaps you'll have to make as a JavaScript developer is wrapping your head around Object Oriented Programming (OOP). This is tough, and that's ok because it's tough for everyone at first. When you start out with JavaScript you're taught to use functions as your primary way of organizing your code. This is fine, but you'll probably find that organizing your code around objects makes larger projects easier to accomplish and improve / maintain.
The cool thing is that what OOP amounts to is an organizational strategy. I have a set of related tasks, how do I go about starting the project and organizing my code? These tasks have some variables and functions that are used to accomplish them, so you create them and write the logic for them to interact. While you can write those out as detached functions and variables, making those variables and functions into properties and methods of an object can make the division between those tasks easier to see and maintain.
Maint
interface RefHandles { | |
scrollToIntent: HTMLElement['scrollTo']; | |
} | |
const targetElement = document.createElement('div'); | |
const handles: RefHandles = { | |
scrollToIntent(...args: any[]) { | |
targetElement.scrollTo(...args); | |
} |
let state = 1 | |
const update = (value) => { | |
state = value | |
document.innerHTML = Array(value % 4).fill('Hello') | |
} | |
setInterval(() => update(Date.now()), 1000) |
<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>My Page</title> | |
<style> | |
li { cursor: pointer } | |
</style> | |
<!-- | |
The first place JS and HTML intersect is a script tag |
import React from 'react' | |
import { useStable, useWatch } from '@objects/hooks' | |
import { through, map, debounce } from '@objects/operators' | |
interface Search { | |
title: string | |
} | |
interface Data { |
wickedElements.define('.my-counter', (element, { events, changes, values }) => { | |
const counter = element.querySelector('.count') | |
const minus = element.querySelector('.minus') | |
const plus = element.querySelector('.plus') | |
changes(values).count(count => { | |
counter.textContent = count | |
}) | |
values.count = 0 |