Real-Time Log Metrics Aggregator

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Your question is Real-Time Log Metrics Aggregator. Start with the requirements on the right.

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Problem

Given a stream of log lines, implement a function that parses each line and returns rolling performance metrics over the last window_seconds. Each valid log line has the format "<timestamp> <service> <latency_ms> <status>", where timestamp is a non-decreasing integer. Ignore malformed lines. For each processed line, output the current metrics for that line's service: total requests in the window, error count (status >= 500), and average latency rounded down.

Constraints

1 <= len(logs) <= 10^5
1 <= window_seconds <= 10^6
Timestamps are non-decreasing integers
0 <= latency_ms <= 10^6
100 <= status <= 599 for valid lines

Function Signature

def aggregate_log_metrics(logs, window_seconds):

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