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fix: prevent single replica proxies from staying unhealthy#12641
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In the peer healthcheck code, when an error pinging peers is detected wewrite a "replicaErr" string with the error reason. However, if there areno peer replicas to ping we returned early without setting the string toempty. This would cause replicas that had peers (which were failing) andthen the peers left to permanently show an error until a new peerappeared.Also demotes DERP replica checking to a "warning" rather than an "error"which should prevent the primary from removing the proxy from the regionmap if DERP meshing is non-functional. This can happen without causingproblems if the peer is shutting down so we don't want to disrupteverything if there isn't an issue.
Emyrk approved these changesMar 18, 2024
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In the peer healthcheck code, when an error pinging peers is detected we write a "replicaErr" string with the error reason. However, if there are no peer replicas to ping we returned early without setting the string to empty. This would cause replicas that had peers (which were failing) and then the peers left to permanently show an error until a new peer appeared.
Also demotes DERP replica checking to a "warning" rather than an "error" which should prevent the primary from removing the proxy from the region map if DERP meshing is non-functional. This can happen without causing problems if the peer is shutting down so we don't want to disrupt everything if there isn't an issue.