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prober: export probe class and metrics from bandwidth prober

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- Wrap each prober function into a probe class that allows associating
  metric labels and custom metrics with a given probe;
- Make sure all existing probe classes set a `class` metric label;
- Move bandwidth probe size from being a metric label to a separate
  gauge metric; this will make it possible to use it to calculate
  average used bandwidth using a PromQL query;
- Also export transfer time for the bandwidth prober (more accurate than
  the total probe time, since it excludes connection establishment
  time).

Updates tailscale/corp#17912

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov
2024-03-27 15:13:34 +00:00
committed by Anton Tolchanov
parent 21671ca374
commit 5336362e64
10 changed files with 215 additions and 116 deletions
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8
prober/dns.go
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@@ -35,8 +35,12 @@ type ForEachAddrOpts struct {
// every time a new IP is discovered. The Probes returned will be closed if an
// IP address is no longer in the DNS record for the given hostname. This can
// be used to healthcheck every IP address that a hostname resolves to.
func ForEachAddr(host string, makeProbes func(netip.Addr) []*Probe, opts ForEachAddrOpts) ProbeFunc {
return makeForEachAddr(host, makeProbes, opts).run
func ForEachAddr(host string, makeProbes func(netip.Addr) []*Probe, opts ForEachAddrOpts) ProbeClass {
feap := makeForEachAddr(host, makeProbes, opts)
return ProbeClass{
Probe: feap.run,
Class: "dns_each_addr",
}
}
func makeForEachAddr(host string, makeProbes func(netip.Addr) []*Probe, opts ForEachAddrOpts) *forEachAddrProbe {