Monitor the Log Pipeline for Dropped Entries
A logging stack can look healthy at the process level while silently discarding entries because of relabeling, backpressure or write failures.
meta-monitoring
Zero Firing Alerts Does Not Mean Monitoring Is Healthy
A broken rule evaluator or missing target can produce a beautifully quiet alert dashboard while the system is blind.
A Storage Cache Needs Its Own Freshness Metric
Caching Docker storage inventory reduced overhead, but a silent refresh failure could otherwise leave old values looking current indefinitely.
OpenSIPS Metrics Availability Is Separate from OpenSIPS Availability
OpenSIPS can continue processing calls while the MI metrics collector fails, leaving the service healthy but observability blind.
Monitor Notification Success, Failure and Resolution Separately
An alert can fire correctly and still never reach the operator if Alertmanager or the external delivery path fails.
Alert Delivery Failure Needs an Alert of Its Own
A monitoring system that detects failures but cannot notify anyone is partially failed even if every Prometheus target remains green.