See the versions page for JIRA at https://marketplace.atlassian.com/plugins/com.mxgraph.jira.plugins.drawio/versions
and Confluence at https://marketplace.atlassian.com/plugins/com.mxgraph.confluence.plugins.diagramly/versions
for the historic version releases.
This seems to show that a release is ever few weeks for bug fixes and major releases in line with Atlassian releases.
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