modularized all source code (#4391)

* modularized all external plugins

* added README.md in plugins

* fixed title

* fixed typo

* relative link to external plugins

* external plugins configuration README

* added plugins link

* remove plugins link

* plugin names are links

* added links to external plugins

* removed unecessary spacing

* list to table

* added language

* fixed typo

* list to table on internal plugins

* added more documentation to internal plugins

* moved python, node, and bash code and configs into the external plugins

* added statsd README

* fix bug with corrupting config.h every 2nd compilation

* moved all config files together with their code

* more documentation

* diskspace info

* fixed broken links in apps.plugin

* added backends docs

* updated plugins readme

* move nc-backend.sh to backends

* created daemon directory

* moved all code outside src/

* fixed readme identation

* renamed plugins.d.plugin to plugins.d

* updated readme

* removed linux- from linux plugins

* updated readme

* updated readme

* updated readme

* updated readme

* updated readme

* updated readme

* fixed README.md links

* fixed netdata tree links

* updated codacy, codeclimate and lgtm excluded paths

* update CMakeLists.txt

* updated automake options at top directory

* libnetdata slit into directories

* updated READMEs

* updated READMEs

* updated ARL docs

* updated ARL docs

* moved /plugins to /collectors

* moved all external plugins outside plugins.d

* updated codacy, codeclimate, lgtm

* updated README

* updated url

* updated readme

* updated readme

* updated readme

* updated readme

* moved api and web into webserver

* web/api web/gui web/server

* modularized webserver

* removed web/gui/version.txt

1 files changed, 68 insertions, 0 deletions

diff --git a/database/rrdcalctemplate.h b/database/rrdcalctemplate.h
new file mode 100644
index 0000000000..5c139fbd37
--- /dev/null
+++ b/database/rrdcalctemplate.h
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_RRDCALCTEMPLATE_H
+#define NETDATA_RRDCALCTEMPLATE_H 1
+
+#include "rrd.h"
+
+// RRDCALCTEMPLATE
+// these are to be applied to charts found dynamically
+// based on their context.
+struct rrdcalctemplate {
+    char *name;
+    uint32_t hash_name;
+
+    char *exec;
+    char *recipient;
+
+    char *context;
+    uint32_t hash_context;
+
+    char *family_match;
+    SIMPLE_PATTERN *family_pattern;
+
+    char *source;                   // the source of this alarm
+    char *units;                    // the units of the alarm
+    char *info;                     // a short description of the alarm
+
+    int update_every;               // update frequency for the alarm
+
+    // the red and green threshold of this alarm (to be set to the chart)
+    calculated_number green;
+    calculated_number red;
+
+    // ------------------------------------------------------------------------
+    // database lookup settings
+
+    char *dimensions;               // the chart dimensions
+    int group;                      // grouping method: average, max, etc.
+    int before;                     // ending point in time-series
+    int after;                      // starting point in time-series
+    uint32_t options;               // calculation options
+
+    // ------------------------------------------------------------------------
+    // notification delay settings
+
+    int delay_up_duration;         // duration to delay notifications when alarm raises
+    int delay_down_duration;       // duration to delay notifications when alarm lowers
+    int delay_max_duration;        // the absolute max delay to apply to this alarm
+    float delay_multiplier;        // multiplier for all delays when alarms switch status
+
+    // ------------------------------------------------------------------------
+    // expressions related to the alarm
+
+    EVAL_EXPRESSION *calculation;
+    EVAL_EXPRESSION *warning;
+    EVAL_EXPRESSION *critical;
+
+    struct rrdcalctemplate *next;
+};
+
+#define RRDCALCTEMPLATE_HAS_CALCULATION(rt) ((rt)->after)
+
+extern void rrdcalctemplate_link_matching(RRDSET *st);
+
+extern void rrdcalctemplate_free(RRDCALCTEMPLATE *rt);
+extern void rrdcalctemplate_unlink_and_free(RRDHOST *host, RRDCALCTEMPLATE *rt);
+
+#endif //NETDATA_RRDCALCTEMPLATE_H