Execution Failure – An alert indicating a trade order did not execute as intended (e.g. order rejected, partially filled, or slippage exceeded). In automated trading, EAs catch such errors and notify the user or log them. For example, if a buy order fails due to insufficient liquidity, the robot may trigger an execution-failure alert so that corrective action (retry or adjust size) can be taken. Advanced users can program custom logic around execution failures, but beginners should at least expect a notification when orders are not filled as expected.

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