Technical guide
Abort a Git merge after conflicts
Stop an unfinished merge, understand the limits of restoring earlier local changes, and choose a separate recovery path for an already committed merge.
Explainer
Read environment variables in Python
Read required and optional environment variables, convert configuration values, and load a .env file during local development.
Explainer
Get the index and value in a Python for loop
Use enumerate to iterate with a counter, set the starting number, and combine it with zip or dictionary items.
Technical guide
Read POST form fields in Express
Parse URL-encoded forms or JSON before the route, validate req.body, and use separate middleware for multipart uploads.
Explainer
Find and read Redis server logs
Locate the Redis server log from its active configuration, follow file or container output, and distinguish server logs from the in-memory slow log.
Explainer
Add a numeric range filter to a Kibana dashboard
Filter dashboard data with KQL, the filter editor, or a Query DSL range clause, and verify that the field has a numeric mapping.
Explainer
Add custom HTTP headers to Prometheus scrapes
Configure scrape authentication or custom headers, check version support, and keep credentials out of source-controlled configuration.
Technical guide
Add an empty directory to a Git repository
Keep a directory in a Git checkout with a placeholder file, or create it during setup. Use ignore rules that allow the placeholder to remain tracked.
Explainer
Scrape an HTTPS target with Prometheus
Set scheme and TLS trust separately from the target address, then diagnose hostname, certificate, and protocol failures.
Explainer
Add keys to a Python dictionary
Insert or replace dictionary entries with assignment, merge values with update, and set a default only when a key is missing.
Explainer
Add the input filename to a Logstash event
Extract a filename from the file input path, account for ECS field names, and route events with a validated index prefix.
Technical guide
Append data to a file in Node.js
Append with callback, promise, synchronous, or stream APIs, and preserve write ordering and backpressure when records matter.