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With monzero supporting slog to get debug output from check commands,
moncheck now supports that too by changing the level to debug.
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With this moncheck itself is also changed to use slog.
The early config parsing is still using log as we do not have any idea
what else to use.
But from then slog is used at all points.
With the additional config options a man page was also added to explain
the new config options.
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This switches the internals of the moncheck instance to using the
monzero.Checker API. This way we can reuse it completely and also see if
it works properly.
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With this, it is now possible to support multiple check instances and
balance the load.
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Any time the state of the check changes, we need to refresh the column.
This will be used in the frontend. This way it is much faster than using
the notifications and also doesn't rely on the last of it being still
around.
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This should make the frontend much easier to handle than before. It
isn't the best solution, but it makes it easier in the frontend for now.
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It happend all the time, that connections were hanging in idle in
transaction state.
This was caused by a rollback stuck behind a sleep loop to wait for the
next bunch of checks to run.
This also replaces a Query() call with QueryRow, as we only expect a
single row and this cleans up the code a bit.
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This can help with determining which exact check connection broke the
check.
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The default worker count was set to 25, which might be too much
depending on the amount of cores available. Now make the default 25 and
let people decide on how many they want to use.
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It would be nice to support multiple notification mechanisms with a way
to disable all or part of them. So for now, this is bound to the check
but may change again in the future.
Apart from that, all notifications get written to the notification
table, so that the notifiers can do their job and ACK their own
notifications.
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This should enable the notifier to make a decent decision on what to do.
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This adds mapping levels to the check runner. When the exit code is
returned, the actual level is looked up using the configured mapping.
After that, the state is entered into the table and added the same way
to the notifications.
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This adds the path environment configuration to control which programs
to call.
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Before the timeout for checks was static. With this change it is finally
an option to configure.
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An acknowledge should be set to false when the alarm switches to an ok
state.
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This output was poluting the log and wasn't necessary.
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The deadlines were wrong all over the place, so this commit finally
fixes that.
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With selecting only the bare minimum we get much nicer performance.
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