Add blackbox exporter to k3s monitoring stack with probe for OOD #466
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…urm-appliance into feat/ood-https-probe
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Installs blackbox exporter into k3s cluster and adds Prometheus scrape job with probe for OOD + grafana dashboard. Also adds blackbox alerting rules from https://github.com/azimuth-cloud/capi-helm-charts/blob/2355ba6151289f35bba9a9e8bd7c372930c323a4/charts/cluster-addons/templates/monitoring/blackbox-exporter.yaml#L98
NB: probes are slower than typical probes in capi helm charts, presumably due to indirection from accessing OOD from inside k3s cluster. About 1.2s seems to be the average