OpsCenter graphs will not display if they have more than 50 metrics
The graph will not display with the message "As configured this graph has more than 50 metrics on it and may cause performance problems when rendered"
At the time of writing this article, this is a hard coded limitation to prevent performance issues.
There is a currently open jira that addresses this issue:
OPSC-5231: Allow end user to customize max lines per chart threshold
Currently this is unresolved. However if you need assistance with this, please contact support.