DevOps

Problem: A three-site RabbitMQ cluster experienced frequent incidents where a single site would become “stuck” and that condition then caused the entire three-site cluster to block. Symptoms reported included intermittent node unresponsiveness, client operations timing out or hanging, and cluster-wide stalls that required manual intervention to recover. The environment was a geographically distributed, multi-site RabbitMQ […]

Problem: A production security scan flagged CVE-2026-42945 in the Kubernetes ingress controller image. The customer reported use of ingress-nginx/controller:v1.12.1 and also verified the issue exists in ingress-nginx/controller:v1.15.1. The scan result and customer concern described this CVE as a high-severity security exposure affecting live traffic handling in production clusters. The deployment used upstream community controller images […]

Problem: The customer reported that deployed container images nginx:1.31 and nginx:1.31.2 contained a high-severity vulnerability: CVE-2026-55200 (libssh2) with a reported CVSS score of 8.3. Their inventory showed the images were based on Debian 13 (trixie) and the finding originated from a packaged libssh2 version present inside the image. No production outage was reported; the request […]

Problem: An application gateway using the Open Enterprise SDK for Apache Kafka reported that Notification ID 8 was accepted and enqueued by the gateway but never showed downstream dispatch evidence for two subscribers. Gateway instrumentation recorded REST_RECEIVE and SEDA_ENQUEUE events for those transactions, while downstream stages (SEDA_DEQUEUE, HTTP_SEND, EDR_WRITE) were absent in the available exports. […]

Problem: A customer preparing to deploy Langfuse from an AWS Marketplace VM requested guidance for sizing, installation in a VPC, required network ports, and hardening. Their intended use was as a shared enterprise evaluation service for AI applications with about 500 million observability events (traces, spans/steps, evaluation scores). Integration requirements included Langfuse Python/JS SDKs, a […]

Problem: The client needed to modernize their Zabbix v7.4.8 setup by migrating a Low-Level Discovery rule away from a static, local JSON file. They required best practices and an architectural recommendation for dynamically triggering and feeding the discovery rule from an external Windows server, while ensuring reliable and efficient updates. Process: Step 1: Architecture Review […]

Problem: During migration to Zabbix 7.4, hundreds of HTTPS health checks failed because the HTTP Host header differed from the SNI hostname used for the TLS handshake. In this environment, monitoring items connect to a load-balancer VIP using a custom Host header to reach specific virtual sites. However, the target servers detected the discrepancy between […]

Problem: On a primary Sonatype Nexus instance running version 3.29.2-02, container images stored in Docker repositories were disappearing without any recorded user DELETE calls. The operator reported unexpected removals, noted release notes referencing a prior cleanup-policy UI bug (where day values were misinterpreted as seconds), and observed that repository artifacts had been cleaned automatically. The […]

Problem: Argo CD UI responsiveness and application sync/refresh operations experienced frequent slowness and timeouts on a bare‑metal OpenShift cluster. Symptoms included UI timeout and long sync times when running bulk refresh/sync operations against an app‑of‑apps topology: sync jobs that exceeded a 1,800s pipeline timeout would fail. The environment manages ~5,200 Argo CD applications on a […]