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, 27 insertions, 0 deletions

diff --git a/plugin/vmem.json b/plugin/vmem.json
new file mode 100644
index 0000000..14d214e
--- /dev/null
+++ b/plugin/vmem.json
@@ -0,0 +1,27 @@
+{
+        "vmpage_faults": {
+                "title": "Page faults",
+                "type": "stacked",
+                "legend": {
+                        "minflt": {
+                                "name": "Minor",
+                                "color": "0000f0"
+                        },
+                        "majflt": {
+                                "name": "Major",
+                                "color": "f00000"
+                        }
+                },
+                "legend_format": "%5.1lf%s"
+        },
+        "vmpage_io": {
+                "title": "Page IO ({{TI}})",
+                "type": "stacked",
+                "legend_format": "%5.1lf%s"
+        },
+        "vmpage_number": {
+                "title": "Pages",
+                "type": "stacked",
+                "legend_format": "%5.1lf%s"
+        }
+}