Browse incidents, troubleshooting guides, AI diagnostics, verified fixes and community discussions related to Monitoring.
## Environment Edge office router in active-active dual‑WAN configuration: WAN1 (1 Gbps, primary), WAN2 (100 Mbps, backup). Router uses per‑session hashing with health probes (ICMP + HTTP every 5s). Session stickiness TTL set to 300s. Large HTTP/FTP...
## Environment vSphere ESXi 7.0 hosts (3-node cluster) backed by SAN LUNs presented via iSCSI; storage array firmware upgraded overnight; several VMs stored on upgraded datastores; HA enabled; one host shows disconnected state briefly during upgrade...
## Environment PostgreSQL 13.8 on Debian 11 VM (8 vCPU, 32 GB RAM), primary and one logical replica on separate hosts; publisher uses pglogical extension for cross-datacenter replication; WAL archived to local filesystem; nightly bulk import job (CO...
## Environment Docker Swarm cluster (4 manager/worker mixed roles) running Docker Engine 20.10.8 on Ubuntu 18.04 hosts. Multiple overlay networks created for different stacks; some were created manually with --subnet and custom options. Under high i...
## Environment Elasticsearch 7.10 cluster on AWS EC2: three data nodes (m5.large equivalents), each node has a single EBS volume mounted at /var/lib/elasticsearch with ext4 filesystem. cluster.routing.allocation.disk.threshold_enabled=true. Nodes ru...
## Environment On-prem Kubernetes 1.23 control plane, 5 worker nodes (Ubuntu 20.04, Docker 20.10.12, kubelet configured with cgroupDriver=systemd). Workers: 128GB RAM, 32 vCPU. Applications deployed as Deployments with requests/limits set (example: ...
## Environment OPNsense 22.1 firewall at HQ terminating IKEv2 IPsec tunnel to Cisco ASR at remote site; both ends use NAT on the WAN side; MTU on LAN interfaces set to 1500; encapsulation adds ~60 bytes of overhead; endpoints include Linux file serv...
## Environment MacBook Pro (macOS 13.5) using a Focus-brand USB audio interface. Users create a CoreAudio aggregate device combining the USB interface and the internal microphone to allow simultaneous routing. Problem appears in Logic Pro and Zoom: ...
## Environment PostgreSQL 13.7 primary on Debian 11 (8-core VM), three synchronous replicas on separate hosts. Streaming replication over TLS (server certs) through a TCP load balancer that enforces SSL session renegotiation every 60s. wal_level = r...
## Environment Home mesh network: primary router XBrand XR500 (firmware 2.4.18), two satellite nodes XR500-S (firmware 2.4.18), ISP modem in bridge mode, clients include Windows 11 laptop (Intel AX200), iPhone 14 Pro (iOS 17.2). Issue reproduces on ...