codesnips

observability

java 
package com.example.tracing;

import jakarta.servlet.Filter;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;

Propagate a Correlation ID Through Servlet Requests With MDC and a Feign Interceptor

java servlet filter
by codesnips 3 tabs
ruby 
module HealthCheckable
  extend ActiveSupport::Concern

  CheckResult = Struct.new(:name, :ok, :message, keyword_init: true)

  private

Rails Health-Check Endpoint With a Controller Concern and Database Ping

rails health-check monitoring
by codesnips 3 tabs
go 
package observability

import (
  "time"

  "go.uber.org/zap"

Sampling logs to reduce noise during high-QPS incidents

go logging observability
by Leah Thompson 1 tab
ruby 
module QueryBudget
  class Counter
    IGNORED = %w[SCHEMA CACHE TRANSACTION].freeze

    attr_reader :count

Per-Request Query Budget (Detect Runaway Pages)

rails performance observability
by codesnips 4 tabs
java 
package com.example.health;

import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.stereotype.Component;

Custom Spring Boot HealthIndicator for Queue Depth on /actuator/health

spring-boot actuator health-check
by codesnips 4 tabs
javascript 
const withTimeout = (promise, timeoutMs, name) => {
  let timer;
  const timeout = new Promise((_, reject) => {
    timer = setTimeout(
      () => reject(new Error(`check '${name}' timed out after ${timeoutMs}ms`)),
      timeoutMs

Express Health-Check Router With a Pluggable Dependency Checks Registry

express health-check observability
by codesnips 3 tabs
python 
import time
from collections import namedtuple

from sqlalchemy import text

CheckResult = namedtuple("CheckResult", ["name", "healthy", "latency_ms", "detail"])

Flask Health-Check Blueprint Reporting Database and Redis Status as JSON

flask health-check observability
by codesnips 3 tabs
ruby 
class ApplicationError < StandardError
  attr_reader :context

  class << self
    def context_keys(*keys)
      @context_keys = keys unless keys.empty?

Structured Exceptions with Context

rails observability exceptions
by codesnips 3 tabs
go 
package health

import (
	"context"
	"sync"
	"time"

Concurrent Readiness Health Check Endpoint in Go with Timeouts

go health-check readiness
by codesnips 3 tabs
go 
package logctx

import (
	"context"
	"log/slog"
)

Request-Scoped Structured Logging with slog and Context in Go

go logging slog
by codesnips 3 tabs
javascript 
const pino = require('pino');
const { AsyncLocalStorage } = require('async_hooks');

const als = new AsyncLocalStorage();

const logger = pino({

Request-Scoped Correlation ID Middleware and Child Logger in Express

express middleware logging
by codesnips 3 tabs