Explainer
Measure elapsed time in Python
Compare Python timing functions, measure elapsed work with perf_counter, and avoid confusing nanosecond units with clock resolution.
Technical guide
Merge a Git feature as one squashed commit
Combine a feature branch’s changes in one target-branch commit, review the staged result, and preserve original history when it still matters.
Technical guide
Apply one specific commit to another Git branch
Use cherry-pick to apply a selected change, inspect its dependencies, and handle conflicts or merge commits explicitly.
Technical guide
Merge two Python dictionaries in one expression
Use dictionary union or unpacking for a new mapping, understand right-hand precedence, and choose explicitly when values should be combined instead of replaced.
Technical guide
Edit an earlier Git commit
Pause an interactive rebase at a selected commit, amend its content or message, and understand how rewriting affects descendants and collaborators.
Explainer
Monitor REST APIs with Prometheus
Combine application request, error, and latency metrics with external HTTP probes, keeping route labels bounded.
Technical guide
Move recent Git commits to a new branch
Keep recent commits reachable on a feature branch, move an unpublished branch back, and choose a history-preserving approach for shared commits.
Explainer
Keep Nginx startup independent of upstream DNS availability
Avoid configuration-time hostname failures with runtime resolution, understand backup limits, and return a controlled maintenance response.
Explainer
Pad strings and numbers with zeros in Python
Use zfill for signed strings, numeric format specifications for integers, and rjust or ljust when you need literal character padding.
Explainer
Parse Apache access logs for analysis
Extract request fields with awk or Python, handle missing response sizes, and match the parser to the configured Apache LogFormat.
Explainer
Parse Nginx access logs for request analysis
Extract fields from combined access logs, count requests by status and second, and avoid misleading timing or time-window analysis.
Technical guide
Read command-line arguments in Node.js
Read positional arguments with process.argv, parse named options with util.parseArgs, and pass arguments through npm scripts correctly.