This updates all source files to use a new standard header for copyright
and license declaration. Notably, copyright no longer includes a date,
and we now use the standard SPDX-License-Identifier header.
This commit was done almost entirely mechanically with perl, and then
some minimal manual fixes.
Updates #6865
Signed-off-by: Will Norris <will@tailscale.com>
By default all probes with the same probe interval that have been added
together will run on a synchronized schedule, which results in spiky
resource usage and potential throttling by third-party systems (for
example, OCSP servers used by the TLS probes).
To address this, prober can now run in "spread" mode that will
introduce a random delay before the first run of each probe.
Signed-off-by: Anton Tolchanov <anton@tailscale.com>
prober: add labels to Probe instances.
This allows especially dynamically-registered probes to have a bunch
more dimensions along which they can be sliced in Prometheus.
Signed-off-by: David Anderson <danderson@tailscale.com>
Turns out, it's annoying to have to wait the entire interval
before getting any monitorable data, especially for very long
interval probes like hourly/daily checks.
Signed-off-by: David Anderson <danderson@tailscale.com>
