Steal Time on VPS: How to Check CPU Wait in Linux
The st column helps detect CPU wait at the virtualization level. A quick vmstat check, its result thresholds, and data for a targeted inquiry to the provider.
Михаил
5 minViews5
GENERAL IT · JOURNAL
Technology in practice
Ideas, experience and solutions for your project.
Administration is included in the cost—who fixes the online store?
The control panel, updates by request, and round-the-clock support leave various tasks for the website owner. A hypothetical failure helps test the limits of VPS maintenance even before choosing a service.
Альбина
7 minViews6
Lowest Price in the Price List: Why Buying from Two Suppliers Can Be More Expensive
On a test cart, we count items and two deliveries, find the volume threshold, and determine what conditions are missing for automatic supplier selection.
Вера
5 minViews1
API Pagination: Why Full Catalog Exports Can Skip Products
Deleting a record between pages shifts the result set. We examine offset, cursor, consistent snapshot, and export resumption after a failure using a small example.
Денис
5 minViews1
Encrypted backup is in place, but there is no access to the data: check your secrets
We separate storage access rights from decryption capabilities using restic as an example, look for circular dependencies, and verify emergency access.
Михаил
5 minViews3
Hosting for a Year with a Discount: After What Term Does Prepayment Become More Cost-Effective?
We compare hypothetical 3,000 rubles per month and 28,800 rubles for a year. We check the project duration, tariff changes, refund of the balance, and renewal price.
Вера
5 minViews4
Webhook Signature Mismatch: Check the Raw JSON Bytes
Two JSON payloads with identical data can have different HMAC signatures. We show a verified example with spaces and the boundaries for authenticating incoming notifications.
Денис
5 minViews3
Order Placed Yesterday: How to Align Dates in the Store API and Reports
A single moment can have different calendar dates in Moscow and UTC. Using a verified example, we examine day boundaries, fractional seconds, and the distinction between delivery date and event time.
Денис
5 minViews3
Acceptance Testing for an Online Store: What to Verify After a Successful Demo
A single demonstration does not define readiness boundaries. We examine a pickup example, how to record reproducible issues, and how to re-verify fixes.
Вера
5 minViews4
How to Validate a JSON File with jq Before Importing to a Store
Check syntax, empty files, multiple documents in sequence, and the top-level type. Read commands with verified examples for jq 1.7.
Денис
4 minViews13
Three Attempts Turned into 27: How to Limit API Request Retries
Retries in modules, libraries, and middleware handlers can multiply. We calculate a sample scenario and analyze the total operation duration, delays, and conditions for resending.
Денис
5 minViews4
Conversion grew in every segment but fell overall: checking traffic composition
Tutorial example with computers and phones: 4.4% converts to 3.6% despite growth in both groups. We calculate weights and separate the report explanation from proof of causes.
Вера
5 minViews2
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