If the attribute you have chosen is not populating the selector list as expected, check the /usr/local/nmis8/var/nmis-nodesum.json file for the attribute. If the attribute is not listed add it to node_summary_field_list in /usr/local/nmis8/conf/Config.nmis. A /usr/local/nmis8/bin/nmis.pl type=summary must run for these changes to take affect.
Adjusting Node Search
For opCharts-3.3.0 and below.
Type of search
The opCharts Node Selector defaults to using prefetched search results. While this can speed searches, it requires the entire data set to be downloaded with each page load, which can slow response time when a large number of nodes exist as the data set can get very large. You can adjust this default from prefetching the search results to loading the results remotely with each search.