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DevOps & observability · #prometheus
Goal The aim is to determine which alerting path—Grafana’s built‑in system or an external Prometheus Alertmanager—delivers dynamic recipient templating reliably while avoiding the use of production credentials. Constraints and Uncertainty Built‑in alerting supports a single‑step setup but currently lacks templated recipient support. Alertmanager integration
Goal Determine whether Alertmanager updates the annotations of an alert that Prometheus re‑emits with the same fingerprint but altered annotation values, especially after component restarts. Constraints and Uncertainty Alert identity is calculated from the alert name and label set, not from annotations. Alertmanager treats annotations as informational and do
We manage several Docker hosts through Portainer CE and want alerting on container and endpoint health. Since CE has no built-in notification engine, we plan to use external tooling (Prometheus/Alertmanager or a lightweight health-check script polling the Portainer API) against the same endpoints Portainer already inventories. The unresolved decision is seve
Prometheus binds its HTTP server to 0.0.0.0 by default in many releases, which exposes the query and admin APIs on every network interface. The --web.listen-address flag can restrict this to 127.0.0.1 or a specific IP, and newer versions support TLS and basic authentication via --web.tls-cert-file and --web.basic-auth-file . When moving from a standalone or
Recovery needs to recreate the working service and its required data after a machine or process is lost. Which artifacts and state need protection, and how should the restore be checked?
Context Apache Pulsar 2.11+ exposes pulsar_broker_msg_backlog with topic and namespace labels, enabling granular alerting. The official documentation recommends alerting on backlog thresholds but provides no universal values and does not resolve whether operators should alert on per-topic series or pre-aggregated namespace/cluster totals. Constraints Per-top
Configuration must be available to the application without exposing credentials in source control, logs or browser code. What belongs in the runtime and which access controls matter?
MetricRegistry Name Validation When adding a custom metric to Dropwizard’s MetricRegistry , the framework throws IllegalArgumentException: metric name cannot contain whitespace if the supplied name includes spaces. This exception is documented in the MetricRegistry Javadoc and is also the root cause of 400 responses from the /metrics endpoint when malformed
The goal is to lower storage costs for a low‑traffic Prometheus deployment by activating the built‑in adaptive sampling feature (available since v2.30). This reduces the ingested sample rate for targets with minimal activity, but it introduces uncertainty about whether short‑lived metric spikes that could trigger alerts are still captured with sufficient fid
grafana
docker
pulsar
dropwizard