Extension of #14673
Once Vault is initially fingerprinted, extend the period since changes
should be infrequent and the fingerprint is relatively expensive since
it is contacting a central Vault server.
Also move the period timer reset *after* the fingerprint. This is
similar to #9435 where the idea is to ensure the retry period starts
*after* the operation is attempted. 15s will be the *minimum* time
between fingerprints now instead of the *maximum* time between
fingerprints.
In the case of Vault fingerprinting, the original behavior might cause
the following:
1. Timer is reset to 15s
2. Fingerprint takes 16s
3. Timer has already elapsed so we immediately Fingerprint again
Even if fingerprinting Vault only takes a few seconds, that may very
well be due to excessive load and backing off our fingerprints is
desirable. The new bevahior ensures we always wait at least 15s between
fingerprint attempts and should allow some natural jittering based on
server load and network latency.
The driver manager is modeled after the device manager and is started by the client.
It's responsible for handling driver lifecycle and reattachment state, as well as
processing the incomming fingerprint and task events from each driver. The mananger
exposes a method for registering event handlers for task events that is used by the
task runner to update the server when a task has been updated with an event.
Since driver fingerprinting has been implemented by the driver manager, it is no
longer needed in the fingerprint mananger and has been removed.
This removes a cyclical dependency when importing client/structs from
dependencies of the plugin_loader, specifically, drivers. Due to
client/config also depending on the plugin_loader.
It also better reflects the ownership of fingerprint structs, as they
are fairly internal to the fingerprint manager.
Adding this fields to the DriverContext object, will allow us to pass
them to the drivers.
An use case for this, will be to emit tagged metrics in the drivers,
which contain all relevant information:
- Job
- TaskGroup
- Task
- ...
Ref: https://github.com/hashicorp/nomad/pull/4185
This PR does:
1. Health message based on detection has format "Driver XXX detected"
and "Driver XXX not detected"
2. Set initial health description based on detection status and don't
wait for the first health check.
3. Combine updating attributes on the node, fingerprint and health
checking update for drivers into a single call back.
4. Condensed driver info in `node status` only shows detected drivers
and make the output less wide by removing spaces.
