Summarize Error Counts from Logs

Problem

Write a Python function that processes a list of log lines and returns a summary of error counts by service. Each log line has the format "timestamp|service|level|message". Count only lines whose level is exactly ERROR, ignore malformed lines, and return a dictionary mapping each service name to its number of errors.

Constraints

• 1 <= len(logs) <= 10^4
• Each log line is a string of length 1 to 500
• A valid line contains exactly 4 fields separated by |
• Service names and levels are case-sensitive