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better exception logging in callbackmetrics
when we fail to render a metric, give a clue as to which metric it was
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@ -15,6 +15,9 @@
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from itertools import chain
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import logging
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logger = logging.getLogger(__name__)
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def flatten(items):
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@ -153,7 +156,11 @@ class CallbackMetric(BaseMetric):
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self.callback = callback
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def render(self):
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value = self.callback()
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try:
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value = self.callback()
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except Exception:
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logger.exception("Failed to render %s", self.name)
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return ["# FAILED to render " + self.name]
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if self.is_scalar():
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return list(self._render_for_labels([], value))
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