Product changelog

Cronitor vs Enterno.io: both handle cron heartbeat monitoring. Enterno adds uptime, SSL, DNS, security in one plan + AI summaries. Pricing, migration, feature matrix.

Healthchecks.io vs Enterno.io: both open-source-friendly cron monitors. API, integrations, pricing, self-host vs SaaS comparison.

Dead Man's Snitch (DMS) vs Enterno.io: the classic Heroku-friendly cron monitor against a multi-tool platform. Pricing, integrations, migration.

LLM — large language model. GPT-5, Claude Opus 4.7, Gemini 2.5, Llama 3. Architecture, inference, sizes.

Nginx rate limiting: limit_req_zone, burst, nodelay, 429 responses, fail2ban integration.

GitOps: infrastructure + app state in Git, automated sync. Flux, ArgoCD. 4 principles.

Envoy: high-performance L7 proxy from Lyft. Backbone of Istio, AWS App Mesh. Configuration, filters.

K8s Operator: custom controller + CRD for stateful apps. Postgres, Redis, Kafka operators. OperatorHub.

gRPC is a high-performance RPC protocol from Google. Protobuf, HTTP/2, streaming. Difference from REST.

Kafka consumer lag: causes, diagnosis via kafka-consumer-groups, scaling partitions, tuning max.poll.records.

Check if your domain or IP is listed in spam databases and DNS blacklists for free. Find out if you're on DNSBL lists. Results in 10 seconds.

Apache Parquet: columnar format for data lake. Compression, column pruning, predicate pushdown. Used by Spark, Trino, DuckDB.

Istio: most-featured service mesh. Envoy sidecars + istiod control plane. mTLS, traffic shaping, observability.

Saga pattern: long-running distributed transactions via events, compensation. Choreography vs orchestration.

Redis memory tuning: maxmemory-policy, eviction, MEMORY USAGE, TTL, fragmentation, jemalloc.

Jaeger — open-source distributed tracing (Uber, CNCF graduated). Spans, service map, architecture.

Postgres performance tuning: shared_buffers, work_mem, vacuum, pg_stat_statements, indexes. 2026 playbook.

Check any website's robots.txt file online for free. Find syntax errors, blocked sections and indexing issues. Instant results in 5 seconds.

Java PKIX path building failed: incomplete chain, missing CA in cacerts. keytool import, debug -Djavax.net.debug.

Apache Iceberg: ACID table format for data lake. Netflix origin, Snowflake/BigQuery/Databricks support 2024+.

OCI: open container image standard. Docker-compatible. Manifests, layers, registries.

Chrome generic ERR_CERT_INVALID — umbrella category for cert errors. How to narrow down the actual cause.

Idempotency — a property where an operation produces the same result on N executions. Idempotency-Key in POST, GET vs POST, patterns.

Shadow DOM: scoped DOM tree + CSS for Web Components. Does not leak outer styles, used in React Native Web, Ionic.

Import Maps: browser-native mapping of bare specifiers to URL. npm without webpack, dev without a bundler, CDN imports.

WASI: POSIX-like interface for WASM outside the browser. WASI 0.2, preview2, wasmtime, Fastly, Fermyon Spin.

OpenTelemetry (OTel): vendor-neutral standard for metrics, logs, traces. CNCF. Auto-instrumentation.

HNSW: Hierarchical Navigable Small World graph. Fastest ANN index for vector search. Parameters M, ef.

Web Streams API: chunked data processing in browser + Node.js. Fetch streaming, compression, crypto, SSE.

Adoption report for WebGPU across Chrome, Safari, Firefox in 2026. Compute shaders, WGSL, Web ML use-cases.

WASI: POSIX-like API for WebAssembly outside the browser. Server-side WASM, Fastly, Fermyon, plugins.

curl: (77) problem with the SSL CA cert. CURLE_SSL_CACERT_BADFILE. CURL_CA_BUNDLE, --cacert, ca-certificates.

Server Actions — async functions on the server called from React components. No API routes. Progressive enhancement.

Edge computing runs code on the nearest point (edge) to the user. Cloudflare Workers, AWS Lambda@Edge, Deno Deploy. Different from CDN.

TCP port 8883 — MQTT over TLS: encrypted IoT messaging. AWS IoT Core, HiveMQ, Mosquitto TLS.

WebGPU: WebGL replacement, compute shaders, WGSL, access to Vulkan/Metal/D3D12. Chrome 113+, Firefox 141+.

Materialized view: precomputed query result stored as a table. Postgres, Oracle. Refresh strategies.

Chrome ERR_HPACK_DECODING_FAILED — HTTP/2 HPACK decompression error. Malformed headers, encoder state corruption.

Serverless containers: Cloud Run, ECS Fargate, Fly Machines. Container instead of function, scale-to-zero, no cold start.

Observability: metrics, logs, traces. Difference from monitoring. OpenTelemetry standard.

Просрочен SSL-сертификат? Узнайте, как быстро диагностировать и исправить ошибку NET::ERR_CERT_DATE_INVALID, продлить сертификат и настроить мониторинг.

Expired SSL certificate? Learn how to quickly diagnose and fix NET::ERR_CERT_DATE_INVALID, renew the certificate, and set up monitoring to prevent it.

SSL handshake failed — подробный разбор причин и диагностики: протоколы, SNI, cipher suites, сертификаты клиента. Примеры openssl и curl для отладки.

SSL handshake failed — deep dive into causes and diagnosis: protocols, SNI, cipher suites, client certs. openssl and curl examples for debugging.

Mixed content блокирует скрипты и стили на HTTPS-сайте. Научим находить HTTP-ресурсы, чинить их автоматически через CSP и upgrade-insecure-requests.

Mixed content breaks scripts and styles on HTTPS. Learn how to find HTTP resources, fix them with CSP and upgrade-insecure-requests automatically.

Self-signed SSL сертификат: зачем нужен, как создать через openssl, добавить в trust store и когда лучше использовать Let's Encrypt или внутреннюю PKI.

Self-signed SSL certificates: when they're appropriate, how to create them with openssl, trust them system-wide, and when to use Let's Encrypt or internal PKI instead.

Wildcard vs SAN сертификат — разбор отличий, цены, безопасность и автоматизация. Какой тип сертификата выбрать для разных архитектур и сколько доменов покрыть.

Wildcard vs SAN certificates — differences, pricing, security, automation. Which cert type to pick for different architectures and how many domains to cover.

Неполная цепочка SSL (incomplete chain) — причина ошибок у мобильных клиентов и API. Как собрать fullchain.pem, добавить intermediate и проверить цепочку.

Incomplete SSL chain causes errors on mobile and API clients. Learn how to assemble fullchain.pem, add intermediates, and verify the chain.

TLS 1.3 vs TLS 1.2 — подробное сравнение: скорость, безопасность, совместимость. Пошаговое руководство по миграции nginx и обратной совместимости.

TLS 1.3 vs TLS 1.2 — detailed comparison: speed, security, compatibility. Step-by-step nginx migration guide with backward compatibility notes.

Бесплатный SSL-сертификат через Let's Encrypt и certbot: пошаговая установка на nginx, Apache, автообновление и подводные камни. Работает на любом Linux.

Free SSL certificate via Let's Encrypt and certbot: step-by-step install for nginx, Apache, auto-renewal, and gotchas. Works on any Linux.

HSTS и preload-лист — как заставить браузер всегда использовать HTTPS. Настройка Strict-Transport-Security, подача в hstspreload.org, подводные камни.

HSTS and preload list — how to force browsers to always use HTTPS. Strict-Transport-Security setup, hstspreload.org submission, gotchas.

Слабые cipher suites (RC4, 3DES, MD5, EXPORT) снижают оценку SSL Labs до B или F. Как проверить, отключить в nginx и выбрать безопасный набор.

Weak cipher suites (RC4, 3DES, MD5, EXPORT) drop SSL Labs grade to B or F. Learn how to detect them, disable in nginx, and pick a safe set.