Use blackbox_exporter with probe_dns_duration_seconds #54
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mem
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This PR: grafana/synthetic-monitoring-agent#54 uses a forked version of blackbox_exporter that exposes a metric called "probe_dns_duration_seconds", which is the time it takes for DNS check to complete from connection to getting back the RR from the DNS server. Signed-off-by: Marcelo E. Magallon <marcelo.magallon@grafana.com>
mem
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This PR: grafana/synthetic-monitoring-agent#54 uses a forked version of blackbox_exporter that exposes a metric called "probe_dns_duration_seconds", which is the time it takes for DNS check to complete from connection to getting back the RR from the DNS server. Signed-off-by: Marcelo E. Magallon <marcelo.magallon@grafana.com>
woodsaj
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Jul 13, 2020
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Given this change was merged upstream, looks like we should just vendor in |
The forked version of blackbox_exporter exposes a metric called "probe_dns_duration_seconds", which is the time it takes for the DNS check to run, from connection to query and getting results back. Currently SM is relying on probe_dns_lookup_time_seconds, which is the wrong metric for this check, as that is reporting the time it takes to resolve the _target_, which is the DNS *server*. Since we normally pass an IP address as the target, that resolution time is very low (microseconds). The change in blackbox_exporter is in this PR: prometheus/blackbox_exporter#662 Signed-off-by: Marcelo E. Magallon <marcelo.magallon@grafana.com>
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mem
added a commit
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Jul 13, 2020
This PR: grafana/synthetic-monitoring-agent#54 uses an updated version of blackbox_exporter that exposes a metric called "probe_dns_duration_seconds", which is the time it takes for DNS check to complete from connection to getting back the RR from the DNS server. The metric has a label "phase" with three different values for each phase of the query, just like probe_http_duration_seconds. Signed-off-by: Marcelo E. Magallon <marcelo.magallon@grafana.com>
mem
added a commit
to grafana/synthetic-monitoring-app
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Jul 13, 2020
This PR: grafana/synthetic-monitoring-agent#54 uses an updated version of blackbox_exporter that exposes a metric called "probe_dns_duration_seconds", which is the time it takes for DNS check to complete from connection to getting back the RR from the DNS server. The metric has a label "phase" with three different values for each phase of the query, just like probe_http_duration_seconds. Signed-off-by: Marcelo E. Magallon <marcelo.magallon@grafana.com>
mem
added a commit
to grafana/synthetic-monitoring-app
that referenced
this pull request
Jul 13, 2020
This PR: grafana/synthetic-monitoring-agent#54 uses an updated version of blackbox_exporter that exposes a metric called "probe_dns_duration_seconds", which is the time it takes for DNS check to complete from connection to getting back the RR from the DNS server. The metric has a label "phase" with three different values for each phase of the query, just like probe_http_duration_seconds. Signed-off-by: Marcelo E. Magallon <marcelo.magallon@grafana.com>
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The forked version of blackbox_exporter exposes a metric called
"probe_dns_duration_seconds", which is the time it takes for the DNS
check to run, from connection to query and getting results back.
Currently SM is relying on probe_dns_lookup_time_seconds, which is the
wrong metric for this check, as that is reporting the time it takes to
resolve the target, which is the DNS server. Since we normally pass
an IP address as the target, that resolution time is very low
(microseconds).
The change in blackbox_exporter is in this PR:
prometheus/blackbox_exporter#662
Signed-off-by: Marcelo E. Magallon marcelo.magallon@grafana.com