Differences between alert frequencies

Only once — an alert is triggered only once. Alert conditions have to match the exact parameters that you set for it to be triggered. 

Once per bar — the system checks every bar and triggers an alert whenever conditions are met (no more than once per bar).

Once per bar close — same as above, but the bar needs to close for an alert to be triggered.

Once per minute or every time — the system checks conditions every minute and triggers an alert whenever conditions are met. 

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