Merging upstream version 1.12.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 32 insertions, 2520 deletions

diff --git a/backends/Makefile.in b/backends/Makefile.in
deleted file mode 100644
index 026377845..000000000
--- a/backends/Makefile.in
+++ /dev/null
@@ -1,658 +0,0 @@
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diff --git a/backends/README.md b/backends/README.md
index cc943d4d7..22dc77597 100644
--- a/backends/README.md
+++ b/backends/README.md
@@ -1,4 +1,4 @@
-# Metrics Long Term Archiving
+# Metrics long term archiving
 
 netdata supports backends for archiving the metrics, or providing long term dashboards,
 using Grafana or other tools, like this:
@@ -36,22 +36,25 @@ X seconds (though, it can send them per second if you need it to).
 
 3. Netdata can filter metrics (at the chart level), to send only a subset of the collected metrics.
 
-4. Three modes of operation (for all backends):
+4. Netdata supports three modes of operation for all backends:
 
-   - `as collected`: the latest collected value is sent to the backend. This means that if netdata
-     is configured to send data to the backend every 10 seconds, only 1 out of 10 values will appear
-     at the backend server. The values are sent exactly as collected, before any multipliers or
-     dividers applied and before any interpolation. This mode emulates other data collectors,
-     such as `collectd` or `telegraf`.
+   - `as-collected` sends to backends the metrics as they are collected, in the units they are collected. 
+   So, counters are sent as counters and gauges are sent as gauges, much like all data collectors do. 
+   For example, to calculate CPU utilization in this format, you need to know how to convert kernel ticks to percentage.
 
-   - `average`: the average of the interpolated values shown on the netdata graphs is sent to the
-     backend. So, if netdata is configured to send data to the backend server every 10 seconds,
-     the average of the 10 values shown on the netdata charts will be used. **If you can't decide
-      which mode to use, use `average`.**
+   - `average` sends to backends normalized metrics from the netdata database. 
+   In this mode, all metrics are sent as gauges, in the units netdata uses. This abstracts data collection 
+   and simplifies visualization, but you will not be able to copy and paste queries from other sources to convert units. 
+   For example, CPU utilization percentage is calculated by netdata, so netdata will convert ticks to percentage and 
+   send the average percentage to the backend.
 
-   - `sum` or `volume`: the sum of the interpolated values shown on the netdata graphs is sent to
-     the backend. So, if netdata is configured to send data to the backend every 10 seconds, the
-     sum of the 10 values shown on the netdata charts will be used.
+   - `sum` or `volume`: the sum of the interpolated values shown on the netdata graphs is sent to the backend. 
+   So, if netdata is configured to send data to the backend every 10 seconds, the sum of the 10 values shown on the 
+   netdata charts will be used.
+
+Time-series databases suggest to collect the raw values (`as-collected`). If you plan to invest on building your monitoring around a time-series database and you already know (or you will invest in learning) how to convert units and normalize the metrics in Grafana or other visualization tools, we suggest to use `as-collected`.
+
+If, on the other hand, you just need long term archiving of netdata metrics and you plan to mainly work with netdata, we suggest to use `average`. It decouples visualization from data collection, so it will generally be a lot simpler. Furthermore, if you use `average`, the charts shown in the back-end will match exactly what you see in Netdata, which is not necessarily true for the other modes of operation.
 
 5. This code is smart enough, not to slow down netdata, independently of the speed of the backend server.
 
@@ -196,3 +199,5 @@ netdata adds 4 alarms:
 
 ![image](https://cloud.githubusercontent.com/assets/2662304/20463779/a46ed1c2-af43-11e6-91a5-07ca4533cac3.png)
 
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fbackends%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/backends/WALKTHROUGH.md b/backends/WALKTHROUGH.md
index b899556ab..0c330ee1a 100644
--- a/backends/WALKTHROUGH.md
+++ b/backends/WALKTHROUGH.md
@@ -67,7 +67,7 @@ chooses the base container images (centos:latest). After running this you should
 be sitting inside the shell of the container.
 
 After we have entered the shell we can install Netdata. This process could not
-be easier. If you take a look at [this link](../installer/#installation), the Netdata devs give us
+be easier. If you take a look at [this link](../packaging/installer/#installation), the Netdata devs give us
 several one-liners to install netdata. I have not had any issues with these one
 liners and their bootstrapping scripts so far (If you guys run into anything do
 share). Run the following command in your container.
@@ -290,3 +290,5 @@ automatically begins to scrape them. Once achieved you do not have to think
 about the monitoring system until Prometheus cannot keep up with your scale.
 Once this happens there are options presented in the Prometheus documentation
 for solving this. Hope this was helpful, happy monitoring.
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fbackends%2FWALKTHROUGH&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/backends/backends.c b/backends/backends.c
index 53a9a2395..da818c50b 100644
--- a/backends/backends.c
+++ b/backends/backends.c
@@ -352,7 +352,7 @@ void *backends_main(void *ptr) {
     rrddim_add(chart_metrics, "lost",     NULL,  1, 1, RRD_ALGORITHM_ABSOLUTE);
     rrddim_add(chart_metrics, "sent",     NULL,  1, 1, RRD_ALGORITHM_ABSOLUTE);
 
-    RRDSET *chart_bytes = rrdset_create_localhost("netdata", "backend_bytes", NULL, "backend", NULL, "Netdata Backend Data Size", "KB", "backends", NULL, 130610, global_backend_update_every, RRDSET_TYPE_AREA);
+    RRDSET *chart_bytes = rrdset_create_localhost("netdata", "backend_bytes", NULL, "backend", NULL, "Netdata Backend Data Size", "KiB", "backends", NULL, 130610, global_backend_update_every, RRDSET_TYPE_AREA);
     rrddim_add(chart_bytes, "buffered", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
     rrddim_add(chart_bytes, "lost",     NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
     rrddim_add(chart_bytes, "sent",     NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
diff --git a/backends/graphite/Makefile.in b/backends/graphite/Makefile.in
deleted file mode 100644
index c214a0e75..000000000
--- a/backends/graphite/Makefile.in
+++ /dev/null
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diff --git a/backends/prometheus/README.md b/backends/prometheus/README.md
index 99a11f942..8cf83cbf4 100644
--- a/backends/prometheus/README.md
+++ b/backends/prometheus/README.md
@@ -9,7 +9,7 @@ Prometheus is a distributed monitoring system which offers a very simple setup a
 
 ### Installing netdata
 
-There are number of ways to install netdata according to [Installation](../../installer/#installation)  
+There are number of ways to install netdata according to [Installation](../../packaging/installer/#installation)  
 The suggested way of installing the latest netdata and keep it upgrade automatically. Using one line installation:
 
 ```
@@ -378,3 +378,5 @@ It can also be changed from the URL, by appending `&prefix=netdata`.
 When the data source is set to `average` or `sum`, netdata remembers the last access of each client accessing prometheus metrics and uses this last access time to respond with the `average` or `sum` of all the entries in the database since that. This means that prometheus servers are not losing data when they access netdata with data source = `average` or `sum`.
 
 To uniquely identify each prometheus server, netdata uses the IP of the client accessing the metrics. If however the IP is not good enough for identifying a single prometheus server (e.g. when prometheus servers are accessing netdata through a web proxy, or when multiple prometheus servers are NATed to a single IP), each prometheus may append `&server=NAME` to the URL. This `NAME` is used by netdata to uniquely identify each prometheus server and keep track of its last access time.
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fbackends%2Fprometheus%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/backends/prometheus/backend_prometheus.c b/backends/prometheus/backend_prometheus.c
index 223b3f9f0..6b0d7ca10 100644
--- a/backends/prometheus/backend_prometheus.c
+++ b/backends/prometheus/backend_prometheus.c
@@ -298,6 +298,9 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                     if (as_collected) {
                         // we need as-collected / raw data
 
+                        if(unlikely(rd->last_collected_time.tv_sec < after))
+                            continue;
+
                         const char *t = "gauge", *h = "gives";
                         if(rd->algorithm == RRD_ALGORITHM_INCREMENTAL ||
                            rd->algorithm == RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL) {
@@ -512,12 +515,9 @@ static inline time_t prometheus_preparation(RRDHOST *host, BUFFER *wb, BACKEND_O
     }
 
     if(output_options & PROMETHEUS_OUTPUT_HELP) {
-        int show_range = 1;
         char *mode;
-        if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED) {
+        if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
             mode = "as collected";
-            show_range = 0;
-        }
         else if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AVERAGE)
             mode = "average";
         else if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_SUM)
@@ -525,19 +525,15 @@ static inline time_t prometheus_preparation(RRDHOST *host, BUFFER *wb, BACKEND_O
         else
             mode = "unknown";
 
-        buffer_sprintf(wb, "# COMMENT netdata \"%s\" to %sprometheus \"%s\", source \"%s\", last seen %lu %s"
+        buffer_sprintf(wb, "# COMMENT netdata \"%s\" to %sprometheus \"%s\", source \"%s\", last seen %lu %s, time range %lu to %lu\n\n"
                 , host->hostname
                 , (first_seen)?"FIRST SEEN ":""
                 , server
                 , mode
                 , (unsigned long)((first_seen)?0:(now - after))
                 , (first_seen)?"never":"seconds ago"
+                , (unsigned long)after, (unsigned long)now
         );
-
-        if(show_range)
-            buffer_sprintf(wb, ", time range %lu to %lu", (unsigned long)after, (unsigned long)now);
-
-        buffer_strcat(wb, "\n\n");
     }
 
     return after;