tor/changes/ticket40491
David Goulet 7a8108ea87 relay: Overload state on DNS timeout is now X% over Y secs
With this commit, we will only report a general overload state if we've
seen more than X% of DNS timeout errors over Y seconds. Previous
behavior was to report when a single timeout occured which is really too
small of a threshold.

The value X is a consensus parameters called
"overload_dns_timeout_scale_percent" which is a scaled percentage
(factor of 1000) so we can represent decimal points for X like 0.5% for
instance. Its default is 1000 which ends up being 1%.

The value Y is a consensus parameters called
"overload_dns_timeout_period_secs" which is the time period for which
will gather DNS errors and once over, we assess if that X% has been
reached ultimately triggering a general overload signal.

Closes #40491

Signed-off-by: David Goulet <dgoulet@torproject.org>
2021-10-20 10:00:03 -04:00

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o Major bugfixes (relay, overload state):
- Report the general overload state for DNS timeout errors only if X% of all
DNS queries over Y seconds are errors. Before that, it only took 1 timeout
to report the overload state which was just too low of a threshold. The X
and Y values are 1% and 10 minutes respectively but they are also
controlled by consensus parameters. Fixes bug 40491; bugfix on
0.4.6.1-alpha.