Merging upstream version 1.12.0.

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

21 files changed, 97 insertions, 4852 deletions

diff --git a/web/api/queries/Makefile.in b/web/api/queries/Makefile.in
deleted file mode 100644
index 295870d2c..000000000
--- a/web/api/queries/Makefile.in
+++ /dev/null
@@ -1,656 +0,0 @@
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diff --git a/web/api/queries/README.md b/web/api/queries/README.md
index 7a517d26e..6a55398ac 100644
--- a/web/api/queries/README.md
+++ b/web/api/queries/README.md
@@ -65,12 +65,12 @@ There are 2 uses that enable this feature:
   
 Using `points` and `gtime` the query engine tries to find a best fit for **database-points**
 vs **result-points** (we call this ratio `group points`). It always tries to keep `group points`
-an integer. Keep in mind the query engine may shift `after` if required.
+an integer. Keep in mind the query engine may shift `after` if required. See also the [example](#example).
 
 #### Time-frame Alignment
 
 Alignment is a very important aspect of netdata queries. Without it, the animated
-charts on the dashboards would constantly change shape during incremental updates.
+charts on the dashboards would constantly [change shape](#example) during incremental updates.
 
 To provide consistent grouping through time, the query engine (by default) aligns
 `after` and `before` to be a multiple of `group points`.
@@ -126,3 +126,47 @@ to the caller.
 The query engine is highly optimized for speed. Most of its modules implement "online"
 versions of the algorithms, requiring just one pass on the database values to produce
 the result.
+
+## Example
+
+When netdata is reducing metrics, it tries to return always the same boundaries. So, if we want 10s averages, it will always return points starting at a `unix timestamp % 10 = 0`.
+
+Let's see why this is needed, by looking at the error case.
+
+Assume we have 5 points:
+
+| time | value |
+| :-: | :-: |
+| 00:01 | 1 |
+| 00:02 | 2 |
+| 00:03 | 3 |
+| 00:04 | 4 |
+| 00:05 | 5 |
+
+At 00:04 you ask for 2 points for 4 seconds in the past. So `group = 2`. netdata would return:
+
+| point | time | value |
+| :-: | :-: | :-: |
+| 1 | 00:01 - 00:02 | 1.5 |
+| 2 | 00:03 - 00:04 | 3.5 |
+
+A second later the chart is to be refreshed, and makes again the same request at 00:05. These are the points that would have been returned:
+
+| point | time | value |
+| :-: | :-: | :-: |
+| 1 | 00:02 - 00:03 | 2.5 |
+| 2 | 00:04 - 00:05 | 4.5 |
+
+**Wait a moment!** The chart was shifted just one point and it changed value! Point 2 was 3.5 and when shifted to point 1 is 2.5! If you see this in a chart, it's a mess. The charts change shape constantly.
+
+For this reason, netdata always aligns the data it returns to the `group`.
+
+When you request `points=1`, netdata understands that you need 1 point for the whole database, so `group = 3600`. Then it tries to find the starting point which would be `timestamp % 3600 = 0` Within a database of 3600 seconds, there is one such point for sure. Then it tries to find the average of 3600 points. But, most probably it will not find 3600 of them (for just 1 out of 3600 seconds this query will return something).
+
+So, the proper way to query the database is to also set at least `after`. The following call will returns 1 point for the last complete 10-second duration (it starts at `timestamp % 10 = 0`):
+
+http://netdata.firehol.org/api/v1/data?chart=system.cpu&points=1&after=-10&options=seconds
+
+When you keep calling this URL, you will see that it returns one new value every 10 seconds, and the timestamp always ends with zero. Similarly, if you say `points=1&after=-5` it will always return timestamps ending with 0 or 5.
+
+[![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%2Fweb%2Fapi%2Fqueries%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
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diff --git a/web/api/queries/average/README.md b/web/api/queries/average/README.md
index 3be434f68..873b60a5f 100644
--- a/web/api/queries/average/README.md
+++ b/web/api/queries/average/README.md
@@ -37,3 +37,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 - [https://en.wikipedia.org/wiki/Average](https://en.wikipedia.org/wiki/Average).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Faverage%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
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diff --git a/web/api/queries/des/README.md b/web/api/queries/des/README.md
index fa546a338..486221cbd 100644
--- a/web/api/queries/des/README.md
+++ b/web/api/queries/des/README.md
@@ -64,3 +64,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 - [https://en.wikipedia.org/wiki/Exponential_smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fdes%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
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diff --git a/web/api/queries/incremental_sum/README.md b/web/api/queries/incremental_sum/README.md
index ef86d4d41..47f833f38 100644
--- a/web/api/queries/incremental_sum/README.md
+++ b/web/api/queries/incremental_sum/README.md
@@ -32,3 +32,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 - none
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fincremental_sum%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/api/queries/max/Makefile.in b/web/api/queries/max/Makefile.in
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diff --git a/web/api/queries/max/README.md b/web/api/queries/max/README.md
index 2ea14bf0b..34dff0215 100644
--- a/web/api/queries/max/README.md
+++ b/web/api/queries/max/README.md
@@ -29,3 +29,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 - [https://en.wikipedia.org/wiki/Sample_maximum_and_minimum](https://en.wikipedia.org/wiki/Sample_maximum_and_minimum).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fmax%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/api/queries/median/Makefile.in b/web/api/queries/median/Makefile.in
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diff --git a/web/api/queries/median/README.md b/web/api/queries/median/README.md
index eb2dbaa96..72f51a244 100644
--- a/web/api/queries/median/README.md
+++ b/web/api/queries/median/README.md
@@ -35,3 +35,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 - [https://en.wikipedia.org/wiki/Median](https://en.wikipedia.org/wiki/Median).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fmedian%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/api/queries/min/Makefile.in b/web/api/queries/min/Makefile.in
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diff --git a/web/api/queries/min/README.md b/web/api/queries/min/README.md
index 3fe13106a..28f6dbf53 100644
--- a/web/api/queries/min/README.md
+++ b/web/api/queries/min/README.md
@@ -29,3 +29,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 - [https://en.wikipedia.org/wiki/Sample_maximum_and_minimum](https://en.wikipedia.org/wiki/Sample_maximum_and_minimum).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fmin%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/api/queries/query.c b/web/api/queries/query.c
index d03b43d3c..f841b65d5 100644
--- a/web/api/queries/query.c
+++ b/web/api/queries/query.c
@@ -492,7 +492,7 @@ static inline void do_dimension(
     r->min = min;
     r->max = max;
     r->before = max_date;
-    r->after = min_date;
+    r->after = min_date - (r->group - 1) * r->st->update_every;
     rrdr_done(r, rrdr_line);
 
     #ifdef NETDATA_INTERNAL_CHECKS
@@ -539,7 +539,7 @@ static void rrd2rrdr_log_request_response_metdata(RRDR *r
          , resampling_group
 
          // after
-         , (size_t)r->after - (group - 1) * r->st->update_every
+         , (size_t)r->after
          , (size_t)after_wanted
          , (size_t)after_requested
          , (size_t)rrdset_first_entry_t(r->st)
@@ -666,26 +666,41 @@ RRDR *rrd2rrdr(
             info("INTERNAL CHECK: %s: requested gtime %ld secs, is greater than the desired duration %ld secs", st->id, resampling_time_requested, duration);
             #endif
 
-            group = available_points; // use all the points
+            after_requested = before_requested - resampling_time_requested;
+            duration = before_requested - after_requested;
+            available_points = duration / st->update_every;
+            group = available_points / points_requested;
         }
-        else {
-            // the points we should group to satisfy gtime
-            resampling_group = resampling_time_requested / st->update_every;
-            if(unlikely(resampling_time_requested % st->update_every)) {
-                #ifdef NETDATA_INTERNAL_CHECKS
-                info("INTERNAL CHECK: %s: requested gtime %ld secs, is not a multiple of the chart's data collection frequency %d secs", st->id, resampling_time_requested, st->update_every);
-                #endif
 
-                resampling_group++;
+        // if the duration is not aligned to resampling time
+        // extend the duration to the past, to avoid a gap at the chart
+        // only when the missing duration is above 1/10th of a point
+        if(duration % resampling_time_requested) {
+            time_t delta = duration % resampling_time_requested;
+            if(delta > resampling_time_requested / 10) {
+                after_requested -= resampling_time_requested - delta;
+                duration = before_requested - after_requested;
+                available_points = duration / st->update_every;
+                group = available_points / points_requested;
             }
+        }
 
-            // adapt group according to resampling_group
-            if(unlikely(group < resampling_group)) group  = resampling_group; // do not allow grouping below the desired one
-            if(unlikely(group % resampling_group)) group += resampling_group - (group % resampling_group); // make sure group is multiple of resampling_group
+        // the points we should group to satisfy gtime
+        resampling_group = resampling_time_requested / st->update_every;
+        if(unlikely(resampling_time_requested % st->update_every)) {
+            #ifdef NETDATA_INTERNAL_CHECKS
+            info("INTERNAL CHECK: %s: requested gtime %ld secs, is not a multiple of the chart's data collection frequency %d secs", st->id, resampling_time_requested, st->update_every);
+            #endif
 
-            //resampling_divisor = group / resampling_group;
-            resampling_divisor = (calculated_number)(group * st->update_every) / (calculated_number)resampling_time_requested;
+            resampling_group++;
         }
+
+        // adapt group according to resampling_group
+        if(unlikely(group < resampling_group)) group  = resampling_group; // do not allow grouping below the desired one
+        if(unlikely(group % resampling_group)) group += resampling_group - (group % resampling_group); // make sure group is multiple of resampling_group
+
+        //resampling_divisor = group / resampling_group;
+        resampling_divisor = (calculated_number)(group * st->update_every) / (calculated_number)resampling_time_requested;
     }
 
     // now that we have group,
@@ -710,7 +725,7 @@ RRDR *rrd2rrdr(
 
     // we need to estimate the number of points, for having
     // an integer number of values per point
-    long points_wanted = (before_wanted - after_requested) / st->update_every / group;
+    long points_wanted = (before_wanted - after_requested) / (st->update_every * group);
 
     time_t after_wanted  = before_wanted - (points_wanted * group * st->update_every) + st->update_every;
     if(unlikely(after_wanted < first_entry_t)) {
@@ -951,7 +966,7 @@ RRDR *rrd2rrdr(
         rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'before' is not wanted 'before'");
 
     // reported 'after' varies, depending on group
-    if((r->after - (group - 1) * r->st->update_every) != after_wanted)
+    if(r->after != after_wanted)
         rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'after' is not wanted 'after'");
 
     #endif
diff --git a/web/api/queries/ses/Makefile.in b/web/api/queries/ses/Makefile.in
deleted file mode 100644
index bb538fac3..000000000
--- a/web/api/queries/ses/Makefile.in
+++ /dev/null
@@ -1,464 +0,0 @@
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diff --git a/web/api/queries/ses/README.md b/web/api/queries/ses/README.md
index b5dacea83..16b153a42 100644
--- a/web/api/queries/ses/README.md
+++ b/web/api/queries/ses/README.md
@@ -52,3 +52,5 @@ Examining last 1 minute `successful` web server responses:
 
 - [https://en.wikipedia.org/wiki/Moving_average#exponential-moving-average](https://en.wikipedia.org/wiki/Moving_average#exponential-moving-average)
 - [https://en.wikipedia.org/wiki/Exponential_smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fses%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/api/queries/stddev/Makefile.in b/web/api/queries/stddev/Makefile.in
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diff --git a/web/api/queries/stddev/README.md b/web/api/queries/stddev/README.md
index 3436ff834..2ef5a2e3b 100644
--- a/web/api/queries/stddev/README.md
+++ b/web/api/queries/stddev/README.md
@@ -85,3 +85,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 Check [https://en.wikipedia.org/wiki/Coefficient_of_variation](https://en.wikipedia.org/wiki/Coefficient_of_variation).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fstddev%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/web/api/queries/sum/Makefile.in b/web/api/queries/sum/Makefile.in
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diff --git a/web/api/queries/sum/README.md b/web/api/queries/sum/README.md
index be6596080..a74ffff69 100644
--- a/web/api/queries/sum/README.md
+++ b/web/api/queries/sum/README.md
@@ -32,3 +32,5 @@ Examining last 1 minute `successful` web server responses:
 ## References
 
 - [https://en.wikipedia.org/wiki/Summation](https://en.wikipedia.org/wiki/Summation).
+
+[![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%2Fweb%2Fapi%2Fqueries%2Fsum%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()