Previously, the `service.name` attribute got overridden with "unknown
service" from the detector used in `Resource::default`. To avoid this,
we are now manually composing the two other detectors.
This gives us a useful set of default labels from within the code yet it
allows overriding all of them using `OTEL_RESOURCE_ATTRIBUTES`.
I recently discovered that the metrics reporting to Google Cloud Metrics
for the relays is actually working. Unfortunately, they are all bucketed
together because we don't set the metadata correctly.
This PR aims to fix that be setting some useful default metadata for
traces and metrics and additionally, discoveres instance ID and name
from GCE metadata.
Related: #2033.
Without masquerading, packets sent by the gateway through the TUN
interface use the wrong source address (the TUN device's address)
instead of the gateway's actual network interface.
We set this env variable in all our uses of the gateway, thus we might
as well remove it and always perform unconditionally.
---------
Signed-off-by: Thomas Eizinger <thomas@eizinger.io>
Co-authored-by: Reactor Scram <ReactorScram@users.noreply.github.com>
