I have 2 pollers for my HVACs - one for temperature and one for humidity. I can get current values on either of them, but can't get a chart to show historical data unless I go back 3 months. I've got them both set to store historical data, and I've verified that there is current data in my DB for those pollers, so something should show up in a chart, but it only says "No data for selected time period" outside of what's showing for end of last year/beginning of this year. The only difference between the data that shows and the data that doesn't is that there's a "RowID" entered for the data that shows.
Edit: More prodding shows that the data will only show up if I set it to "Get Table" instead of "Get" or "Get Next". The MIB in question is contained in a table, but is a single value, so why would I have to "Get Table" on it to get it to be charted?
Edit 2: On a related note, somehow a chart got added to my Node Details page for each of the two pollers without my interaction. What's causing this and what's the logic behind it? Is there a setting where I can turn this off? I don't want charts randomly added to my pages without me asking.