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Provides interface for calling user hooks
When initializing, loads all hooks located in HOOKS_DIRS. Then it can called
with application name as argument. Observer ensures calling all hooks defined for the application.
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Decorator for tracer hooks.
Example::
from tracer import hooks
@hooks.match("foo")
def hook_app():
print("Hey, application foo was found")
.. note::
You can match multiple applications by calling ``@hooks.match`` with list of them.
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