graph.php: use JSON plugins instead of including PHP plugin files

A couple of big changes here. A lot of logic moved to graph.php.

The PHP plugin files have been rewritten to JSON. In these JSON files
*everything* is optional. Also *NOT* having a JSON plugin file won't
block you from having a graph. The JSON will just make the graphs
prettier (by having a title, y-axis title, legend, colors, etc..).

The Collectd types.db file is parsed and used to determine RRD content.
When things are not defined in the JSON it will fallback to a default.

1 files changed, 13 insertions, 0 deletions

diff --git a/plugin/conntrack.json b/plugin/conntrack.json
new file mode 100644
index 0000000..d3e218e
--- /dev/null
+++ b/plugin/conntrack.json
@@ -0,0 +1,13 @@
+{
+        "conntrack": {
+                "title": "Conntrack entries",
+                "vertical": "Entries",
+                "legend": {
+                        "value": {
+                                "name": "Entries",
+                                "color": "0000f0"
+                        }
+                },
+                "legend_format": "%.1lf"
+        }
+}