Minor Description
The metrics API appears to have changed between Solr 7 and 8. Some of the effected metrics are used on the Admin UI Dashboard view which results in the view not rendering correctly. The main culprits appear to be os.totalPhysicalMemorySize not being calculated in Solr 8 and two missing metrics os.totalSwapSpaceSize and os.freeSwapSpaceSize which are all used in the Admin UI Dashboard view page. Values memory.heap.committed, memory.heap.init, memory.heap.max also appear to be using the identical value in Solr 8. Below is an extract of the javascrpit used on the Admin Dashboard and a comparison between metrics reported in Solr 7 and 8. The function "parse_memory_value" is where the JavaScript error appears to be thrown with the missing metrics.
Solr 8 "os.totalPhysicalMemorySize":0, (Not calculated) "os.freePhysicalMemorySize":792087998464, "os.totalSwapSpaceSize" (Metric not present) "os.freeSwapSpaceSize": (Metric not present) "memory.heap.committed":8589934592, "memory.heap.init":8589934592, "memory.heap.max":8589934592, "memory.heap.usage":0.006413557566702366, "memory.heap.used":55092040, "memory.non-heap.committed":97910784, "memory.non-heap.init":7667712, "memory.non-heap.max":-1, "memory.non-heap.usage":-9.2249552E7, "memory.non-heap.used":92249712, Solr 7 "os.totalPhysicalMemorySize":810586099712, "os.freePhysicalMemorySize":756665888768, "os.totalSwapSpaceSize":0, "os.freeSwapSpaceSize":0 "memory.heap.committed":12348030976, "memory.heap.init":12884901888, "memory.heap.max":12348030976, "memory.heap.usage":0.313836514301922, "memory.heap.used":3875263000, "memory.non-heap.committed":145039360, "memory.non-heap.init":7667712, "memory.non-heap.max":-1, "memory.non-heap.usage":-1.30145664E8, "memory.non-heap.used":130145824, +main.js (Admin Dashboard)+ // physical memory var memoryMax = parse_memory_value(data.system.totalPhysicalMemorySize); $scope.memoryTotal = parse_memory_value(data.system.totalPhysicalMemorySize - data.system.freePhysicalMemorySize); $scope.memoryPercentage = ($scope.memoryTotal / memoryMax * 100).toFixed(1)+ "%"; $scope.memoryMax = pretty_print_bytes(memoryMax); $scope.memoryTotalDisplay = pretty_print_bytes($scope.memoryTotal); // swap space var swapMax = parse_memory_value(data.system.totalSwapSpaceSize); $scope.swapTotal = parse_memory_value(data.system.totalSwapSpaceSize - data.system.freeSwapSpaceSize); $scope.swapPercentage = ($scope.swapTotal / swapMax * 100).toFixed(1)+ "%"; $scope.swapMax = pretty_print_bytes(swapMax); $scope.swapTotalDisplay = pretty_print_bytes($scope.swapTotal); // file handles $scope.fileDescriptorPercentage = (data.system.openFileDescriptorCount / data.system.maxFileDescriptorCount *100).toFixed(1) + "%"; // java memory var javaMemoryMax = parse_memory_value(data.jvm.memory.raw.max || data.jvm.memory.max); $scope.javaMemoryTotal = parse_memory_value(data.jvm.memory.raw.total || data.jvm.memory.total); $scope.javaMemoryUsed = parse_memory_value(data.jvm.memory.raw.used || data.jvm.memory.used); $scope.javaMemoryTotalPercentage = ($scope.javaMemoryTotal / javaMemoryMax *100).toFixed(1) + "%"; $scope.javaMemoryUsedPercentage = ($scope.javaMemoryUsed / $scope.javaMemoryTotal *100).toFixed(1) + "%"; $scope.javaMemoryPercentage = ($scope.javaMemoryUsed / javaMemoryMax * 100).toFixed(1) + "%"; $scope.javaMemoryTotalDisplay = pretty_print_bytes($scope.javaMemoryTotal); $scope.javaMemoryUsedDisplay = pretty_print_bytes($scope.javaMemoryUsed); // @todo These should really be an AngularJS Filter: {{ javaMemoryUsed | bytes }} $scope.javaMemoryMax = pretty_print_bytes(javaMemoryMax); var parse_memory_value = function( value ) { if( value !== Number( value ) ) { var units = 'BKMGTPEZY'; var match = value.match( /^(\d+([,\.]\d+)?) (\w).*$/ ); var value = parseFloat( match[1] ) * Math.pow( 1024, units.indexOf( match[3].toUpperCase() ) ); } return value; };