Checkmk Werk 13519: <tt>check_icmp</tt>: Fix "Failed to resolve $: Name or service not known"

ID: 13519 Title: <tt>check_icmp</tt>: Fix "Failed to resolve $: Name or service not known" Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 Depending on the configuration, the active check <tt>check_icmp</tt> (ICMP Echo Requests) crashed with "Failed to resolve $: Name or service not known". This happened with the following configuration options below "Alternative address to ping": <ul> <li>Ping all IPv4 addresses</li> <li>Ping all IPv6 addresses</li> <li>Ping additional IPv4 addresses</li> <li>Ping additional IPv6 addresses</li> <li>Ping IPv4 address identified by its index</li> <li>Ping IPv6 address identified by its index</li> </ul>