> **Note:** [Time series panel]({{< relref "./time-series/_index.md" >}}) visualization is going to replace the Graph panel visualization in a future release.
The graph panel can render metrics as a line, a path of dots, or a series of bars. This type of graph is versatile enough to display almost any time-series data.
- **Stack -** Each series is stacked on top of another.
- **Percent -** Available when **Stack** is selected. Each series is drawn as a percentage of the total of all series.
- **Null value -** How null values are displayed. _This is a very important setting._ See note below.
- **connected -** If there is a gap in the series, meaning a null value or values, then the line will skip the gap and connect to the next non-null value.
- **null -** (default) If there is a gap in the series, meaning a null value, then the line in the graph will be broken and show the gap.
> **Note:** If you are monitoring a server's CPU load and the load reaches 100%, then the server will lock up and the agent sending statistics will not be able to collect the load statistic. This leads to a gap in the metrics and having the default as _null_ means Grafana will show the gaps and indicate that something is wrong. If this is set to _connected_, then it would be easy to miss this signal.
- **All series -** The hover tooltip shows all series in the graph. Grafana highlights the series that you are hovering over in bold in the series list in the tooltip.
- **Sort order -** Sorts the order of series in the hover tooltip if you have selected **All series** mode. When you hover your cursor on a graph, Grafana displays the values associated with the lines. Generally users are most interested in the highest or lowest values. Sorting these values can make it much easier to find the data of interest.
- **None -** The order of the series in the tooltip is determined by the sort order in your query. For example, they could be alphabetically sorted by series name.
- **Increasing -** The series in the hover tooltip are sorted by value and in increasing order, with the lowest value at the top of the list.
- **Decreasing -** The series in the hover tooltip are sorted by value and in decreasing order, with the highest value at the top of the list.
Series overrides allow a series in a graph panel to be rendered differently from the others. You can customize display options on a per-series bases or by using regex rules. For example, one series can have a thicker line width to make it stand out or be moved to the right Y-axis.
- **Align -** Select to align left and right Y-axes by value. (default unchecked/false)
- **Level -** Available when **Align** is selected. Value to use for alignment of left and right Y-axes, starting from Y=0. (default 0)
### X-Axis
- **Show -** Click to show or hide the axis.
- **Mode -** The display mode completely changes the visualization of the graph panel. It's like three panels in one. The main mode is the time series mode with time on the X-axis. The other two modes are a basic bar chart mode with series on the X-axis instead of time and a histogram mode.
- **Histogram -** Converts the graph into a histogram. A histogram is a kind of bar chart that groups numbers into ranges, often called buckets or bins. Taller bars show that more data falls in that range.
The legend values are calculated on the client side by Grafana and depend on what type of aggregation or point consolidation your metric query is using. All the above legend values cannot be correct at the same time.
For example, if you plot a rate like requests/second, this is probably using average as an aggregator, then the Total in the legend will not represent the total number of requests. It is just the sum of all data points received by Grafana.
### Hide series
Hide series when all values of a series from a metric query are of a specific value.
- **With only nulls -** Value=null (default unchecked)
Time regions allow you to highlight certain time regions of the graph to make it easier to see for example weekends, business hours and/or off work hours. All configured time regions refer to UTC time.
