Merging upstream version 1.29.0.

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

24 files changed, 133 insertions, 5420 deletions

diff --git a/web/api/queries/Makefile.in b/web/api/queries/Makefile.in
deleted file mode 100644
index b339c1178..000000000
--- a/web/api/queries/Makefile.in
+++ /dev/null
@@ -1,711 +0,0 @@
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diff --git a/web/api/queries/README.md b/web/api/queries/README.md
index 458179c71..31ec49655 100644
--- a/web/api/queries/README.md
+++ b/web/api/queries/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Database Queries"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/README.md
+-->
+
 # Database Queries
 
 Netdata database can be queried with `/api/v1/data` and `/api/v1/badge.svg` REST API methods.
@@ -83,7 +88,7 @@ To disable alignment, pass `&options=unaligned` to the query.
 
 To execute the query, the engine evaluates all dimensions of the chart, one after another.
 
-The engine does not evaluate dimensions that do not match the [simple pattern](../../../libnetdata/simple_pattern)
+The engine does not evaluate dimensions that do not match the [simple pattern](/libnetdata/simple_pattern/README.md)
 given at the `dimensions` parameter, except when `options=percentage` is given (this option
 requires all the dimensions to be evaluated to find the percentage of each dimension vs to chart
 total).
diff --git a/web/api/queries/average/Makefile.in b/web/api/queries/average/Makefile.in
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diff --git a/web/api/queries/average/README.md b/web/api/queries/average/README.md
index 6b2c0dfa4..f32a67571 100644
--- a/web/api/queries/average/README.md
+++ b/web/api/queries/average/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Average or Mean"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/average/README.md
+-->
+
 # Average or Mean
 
 > This query is available as `average` and `mean`.
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diff --git a/web/api/queries/des/README.md b/web/api/queries/des/README.md
index 57ac805d8..5505de5a6 100644
--- a/web/api/queries/des/README.md
+++ b/web/api/queries/des/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "double exponential smoothing"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/des/README.md
+-->
+
 # double exponential smoothing
 
 Exponential smoothing is one of many window functions commonly applied to smooth data in signal
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diff --git a/web/api/queries/incremental_sum/README.md b/web/api/queries/incremental_sum/README.md
index 108788902..e5f3dfc0c 100644
--- a/web/api/queries/incremental_sum/README.md
+++ b/web/api/queries/incremental_sum/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Incremental Sum (`incremental_sum`)"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/incremental_sum/README.md
+-->
+
 # Incremental Sum (`incremental_sum`)
 
 This modules finds the incremental sum of a period, which `last value - first value`.
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diff --git a/web/api/queries/max/README.md b/web/api/queries/max/README.md
index b0f6f648f..32b1d434c 100644
--- a/web/api/queries/max/README.md
+++ b/web/api/queries/max/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Max"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/max/README.md
+-->
+
 # Max
 
 This module finds the max value in the time-frame given.
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 a69801249..25ce8b8d6 100644
--- a/web/api/queries/median/README.md
+++ b/web/api/queries/median/README.md
@@ -1,3 +1,9 @@
+<!--
+title: "Median"
+description: "Use median in API queries and health entities to find the 'middle' value from a sample, eliminating any unwanted spikes in the returned metrics."
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/median/README.md
+-->
+
 # Median
 
 The median is the value separating the higher half from the lower half of a data sample
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-install-html-am:
-
-install-info: install-info-am
-
-install-info-am:
-
-install-man:
-
-install-pdf: install-pdf-am
-
-install-pdf-am:
-
-install-ps: install-ps-am
-
-install-ps-am:
-
-installcheck-am:
-
-maintainer-clean: maintainer-clean-am
-	-rm -f Makefile
-maintainer-clean-am: distclean-am maintainer-clean-generic
-
-mostlyclean: mostlyclean-am
-
-mostlyclean-am: mostlyclean-generic
-
-pdf: pdf-am
-
-pdf-am:
-
-ps: ps-am
-
-ps-am:
-
-uninstall-am:
-
-.MAKE: install-am install-strip
-
-.PHONY: all all-am check check-am clean clean-generic cscopelist-am \
-	ctags-am distclean distclean-generic distdir dvi dvi-am html \
-	html-am info info-am install install-am install-data \
-	install-data-am install-dvi install-dvi-am install-exec \
-	install-exec-am install-html install-html-am install-info \
-	install-info-am install-man install-pdf install-pdf-am \
-	install-ps install-ps-am install-strip installcheck \
-	installcheck-am installdirs maintainer-clean \
-	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
-	pdf-am ps ps-am tags-am uninstall uninstall-am
-
-.PRECIOUS: Makefile
-
-
-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/web/api/queries/min/README.md b/web/api/queries/min/README.md
index 6276faec7..69ef4ea12 100644
--- a/web/api/queries/min/README.md
+++ b/web/api/queries/min/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Min"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/min/README.md
+-->
+
 # Min
 
 This module finds the min value in the time-frame given.
diff --git a/web/api/queries/query.c b/web/api/queries/query.c
index b0eb826d6..3b9077cd6 100644
--- a/web/api/queries/query.c
+++ b/web/api/queries/query.c
@@ -281,7 +281,7 @@ RRDR_GROUPING web_client_api_request_v1_data_group(const char *name, RRDR_GROUPI
 
 // ----------------------------------------------------------------------------
 
-static void rrdr_disable_not_selected_dimensions(RRDR *r, RRDR_OPTIONS options, const char *dims) {
+static void rrdr_disable_not_selected_dimensions(RRDR *r, RRDR_OPTIONS options, const char *dims, RRDDIM *temp_rd) {
     rrdset_check_rdlock(r->st);
 
     if(unlikely(!dims || !*dims || (dims[0] == '*' && dims[1] == '\0'))) return;
@@ -300,7 +300,7 @@ static void rrdr_disable_not_selected_dimensions(RRDR *r, RRDR_OPTIONS options,
 
     RRDDIM *d;
     long c, dims_selected = 0, dims_not_hidden_not_zero = 0;
-    for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
+    for(c = 0, d = temp_rd?temp_rd:r->st->dimensions; d ;c++, d = d->next) {
         if(    (match_ids   && simple_pattern_matches(pattern, d->id))
                || (match_names && simple_pattern_matches(pattern, d->name))
                 ) {
@@ -332,7 +332,7 @@ static void rrdr_disable_not_selected_dimensions(RRDR *r, RRDR_OPTIONS options,
         // but they are all zero
         // enable the selected ones
         // to avoid returning an empty chart
-        for(c = 0, d = r->st->dimensions; d ;c++, d = d->next)
+        for(c = 0, d = temp_rd?temp_rd:r->st->dimensions; d ;c++, d = d->next)
             if(unlikely(r->od[c] & RRDR_DIMENSION_SELECTED))
                 r->od[c] |= RRDR_DIMENSION_NONZERO;
     }
@@ -573,6 +573,12 @@ static inline void do_dimension_fixedstep(
 #endif
         db_now = now; // this is needed to set db_now in case the next_metric implementation does not set it
         storage_number n = rd->state->query_ops.next_metric(&handle, &db_now);
+        if(unlikely(db_now > before_wanted)) {
+#ifdef NETDATA_INTERNAL_CHECKS
+            r->internal.log = "stopped, because attempted to access the db after 'wanted before'";
+#endif
+            break;
+        }
         for ( ; now <= db_now ; now += dt) {
             calculated_number value = NAN;
             if(likely(now >= db_now && does_storage_number_exist(n))) {
@@ -673,6 +679,7 @@ static void rrd2rrdr_log_request_response_metdata(RRDR *r
         //, size_t before_slot
         , const char *msg
         ) {
+    netdata_rwlock_rdlock(&r->st->rrdset_rwlock);
     info("INTERNAL ERROR: rrd2rrdr() on %s update every %d with %s grouping %s (group: %ld, resampling_time: %ld, resampling_group: %ld), "
          "after (got: %zu, want: %zu, req: %zu, db: %zu), "
          "before (got: %zu, want: %zu, req: %zu, db: %zu), "
@@ -694,19 +701,19 @@ static void rrd2rrdr_log_request_response_metdata(RRDR *r
          , (size_t)r->after
          , (size_t)after_wanted
          , (size_t)after_requested
-         , (size_t)rrdset_first_entry_t(r->st)
+         , (size_t)rrdset_first_entry_t_nolock(r->st)
 
          // before
          , (size_t)r->before
          , (size_t)before_wanted
          , (size_t)before_requested
-         , (size_t)rrdset_last_entry_t(r->st)
+         , (size_t)rrdset_last_entry_t_nolock(r->st)
 
          // duration
          , (size_t)(r->before - r->after + r->st->update_every)
          , (size_t)(before_wanted - after_wanted + r->st->update_every)
          , (size_t)(before_requested - after_requested)
-         , (size_t)((rrdset_last_entry_t(r->st) - rrdset_first_entry_t(r->st)) + r->st->update_every)
+         , (size_t)((rrdset_last_entry_t_nolock(r->st) - rrdset_first_entry_t_nolock(r->st)) + r->st->update_every)
 
          // slot
          /*
@@ -724,6 +731,7 @@ static void rrd2rrdr_log_request_response_metdata(RRDR *r
          // message
          , msg
     );
+    netdata_rwlock_unlock(&r->st->rrdset_rwlock);
 }
 #endif // NETDATA_INTERNAL_CHECKS
 
@@ -734,6 +742,7 @@ static int rrdr_convert_before_after_to_absolute(
         , int update_every
         , time_t first_entry_t
         , time_t last_entry_t
+        , RRDR_OPTIONS options
 ) {
     int absolute_period_requested = -1;
     long long after_requested, before_requested;
@@ -779,10 +788,12 @@ static int rrdr_convert_before_after_to_absolute(
 
     // make sure they are within our timeframe
     if(before_requested > last_entry_t)  before_requested = last_entry_t;
-    if(before_requested < first_entry_t) before_requested = first_entry_t;
+    if(before_requested < first_entry_t && !(options & RRDR_OPTION_ALLOW_PAST))
+        before_requested = first_entry_t;
 
     if(after_requested > last_entry_t)  after_requested = last_entry_t;
-    if(after_requested < first_entry_t) after_requested = first_entry_t;
+    if(after_requested < first_entry_t && !(options & RRDR_OPTION_ALLOW_PAST))
+        after_requested = first_entry_t;
 
     // check if they are reversed
     if(after_requested > before_requested) {
@@ -810,6 +821,7 @@ static RRDR *rrd2rrdr_fixedstep(
         , time_t first_entry_t
         , time_t last_entry_t
         , int absolute_period_requested
+        , struct context_param *context_param_list
 ) {
     int aligned = !(options & RRDR_OPTION_NOT_ALIGNED);
 
@@ -817,8 +829,10 @@ static RRDR *rrd2rrdr_fixedstep(
     time_t duration = before_requested - after_requested;
     long available_points = duration / update_every;
 
+    RRDDIM *temp_rd = context_param_list ? context_param_list->rd : NULL;
+
     if(duration <= 0 || available_points <= 0)
-        return rrdr_create(st, 1);
+        return rrdr_create(st, 1, context_param_list);
 
     // check the number of wanted points in the result
     if(unlikely(points_requested < 0)) points_requested = -points_requested;
@@ -976,7 +990,7 @@ static RRDR *rrd2rrdr_fixedstep(
     // initialize our result set
     // this also locks the chart for us
 
-    RRDR *r = rrdr_create(st, points_wanted);
+    RRDR *r = rrdr_create(st, points_wanted, context_param_list);
     if(unlikely(!r)) {
         #ifdef NETDATA_INTERNAL_CHECKS
         error("INTERNAL CHECK: Cannot create RRDR for %s, after=%u, before=%u, duration=%u, points=%ld", st->id, (uint32_t)after_wanted, (uint32_t)before_wanted, (uint32_t)duration, points_wanted);
@@ -1049,7 +1063,7 @@ static RRDR *rrd2rrdr_fixedstep(
     rrdset_check_rdlock(st);
 
     if(dimensions)
-        rrdr_disable_not_selected_dimensions(r, options, dimensions);
+        rrdr_disable_not_selected_dimensions(r, options, dimensions, temp_rd);
 
 
     // -------------------------------------------------------------------------
@@ -1060,7 +1074,7 @@ static RRDR *rrd2rrdr_fixedstep(
 
     RRDDIM *rd;
     long c, dimensions_used = 0, dimensions_nonzero = 0;
-    for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
+    for(rd = temp_rd?temp_rd:st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
 
         // if we need a percentage, we need to calculate all dimensions
         if(unlikely(!(options & RRDR_OPTION_PERCENTAGE) && (r->od[c] & RRDR_DIMENSION_HIDDEN))) {
@@ -1153,7 +1167,7 @@ static RRDR *rrd2rrdr_fixedstep(
     if(unlikely(options & RRDR_OPTION_NONZERO && !dimensions_nonzero)) {
         // all the dimensions are zero
         // mark them as NONZERO to send them all
-        for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
+        for(rd = temp_rd?temp_rd:st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
             if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
             r->od[c] |= RRDR_DIMENSION_NONZERO;
         }
@@ -1178,6 +1192,7 @@ static RRDR *rrd2rrdr_variablestep(
         , time_t last_entry_t
         , int absolute_period_requested
         , struct rrdeng_region_info *region_info_array
+        , struct context_param *context_param_list
 ) {
     int aligned = !(options & RRDR_OPTION_NOT_ALIGNED);
 
@@ -1185,9 +1200,11 @@ static RRDR *rrd2rrdr_variablestep(
     time_t duration = before_requested - after_requested;
     long available_points = duration / update_every;
 
+    RRDDIM *temp_rd = context_param_list ? context_param_list->rd : NULL;
+
     if(duration <= 0 || available_points <= 0) {
         freez(region_info_array);
-        return rrdr_create(st, 1);
+        return rrdr_create(st, 1, context_param_list);
     }
 
     // check the number of wanted points in the result
@@ -1346,7 +1363,7 @@ static RRDR *rrd2rrdr_variablestep(
     // initialize our result set
     // this also locks the chart for us
 
-    RRDR *r = rrdr_create(st, points_wanted);
+    RRDR *r = rrdr_create(st, points_wanted, context_param_list);
     if(unlikely(!r)) {
         #ifdef NETDATA_INTERNAL_CHECKS
         error("INTERNAL CHECK: Cannot create RRDR for %s, after=%u, before=%u, duration=%u, points=%ld", st->id, (uint32_t)after_wanted, (uint32_t)before_wanted, (uint32_t)duration, points_wanted);
@@ -1422,7 +1439,7 @@ static RRDR *rrd2rrdr_variablestep(
     rrdset_check_rdlock(st);
 
     if(dimensions)
-        rrdr_disable_not_selected_dimensions(r, options, dimensions);
+        rrdr_disable_not_selected_dimensions(r, options, dimensions, temp_rd);
 
 
     // -------------------------------------------------------------------------
@@ -1433,7 +1450,7 @@ static RRDR *rrd2rrdr_variablestep(
 
     RRDDIM *rd;
     long c, dimensions_used = 0, dimensions_nonzero = 0;
-    for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
+    for(rd = temp_rd?temp_rd:st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
 
         // if we need a percentage, we need to calculate all dimensions
         if(unlikely(!(options & RRDR_OPTION_PERCENTAGE) && (r->od[c] & RRDR_DIMENSION_HIDDEN))) {
@@ -1527,7 +1544,7 @@ static RRDR *rrd2rrdr_variablestep(
     if(unlikely(options & RRDR_OPTION_NONZERO && !dimensions_nonzero)) {
         // all the dimensions are zero
         // mark them as NONZERO to send them all
-        for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
+        for(rd = temp_rd?temp_rd:st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
             if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
             r->od[c] |= RRDR_DIMENSION_NONZERO;
         }
@@ -1548,16 +1565,32 @@ RRDR *rrd2rrdr(
         , long resampling_time_requested
         , RRDR_OPTIONS options
         , const char *dimensions
-) {
+        , struct context_param *context_param_list
+)
+{
     int rrd_update_every;
     int absolute_period_requested;
-    time_t first_entry_t = rrdset_first_entry_t(st);
-    time_t last_entry_t  = rrdset_last_entry_t(st);
+
+    time_t first_entry_t;
+    time_t last_entry_t;
+    if (context_param_list) {
+        first_entry_t = context_param_list->first_entry_t;
+        last_entry_t = context_param_list->last_entry_t;
+    } else {
+        rrdset_rdlock(st);
+        first_entry_t = rrdset_first_entry_t_nolock(st);
+        last_entry_t = rrdset_last_entry_t_nolock(st);
+        rrdset_unlock(st);
+    }
 
     rrd_update_every = st->update_every;
     absolute_period_requested = rrdr_convert_before_after_to_absolute(&after_requested, &before_requested,
                                                                       rrd_update_every, first_entry_t,
-                                                                      last_entry_t);
+                                                                      last_entry_t, options);
+    if (options & RRDR_OPTION_ALLOW_PAST)
+        if (first_entry_t > after_requested)
+            first_entry_t = after_requested;
+
 #ifdef ENABLE_DBENGINE
     if (st->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE) {
         struct rrdeng_region_info *region_info_array;
@@ -1565,7 +1598,7 @@ RRDR *rrd2rrdr(
 
         /* This call takes the chart read-lock */
         regions = rrdeng_variable_step_boundaries(st, after_requested, before_requested,
-                                                  &region_info_array, &max_interval);
+                                                  &region_info_array, &max_interval, context_param_list);
         if (1 == regions) {
             if (region_info_array) {
                 if (rrd_update_every != region_info_array[0].update_every) {
@@ -1573,28 +1606,28 @@ RRDR *rrd2rrdr(
                     /* recalculate query alignment */
                     absolute_period_requested =
                             rrdr_convert_before_after_to_absolute(&after_requested, &before_requested, rrd_update_every,
-                                                                  first_entry_t, last_entry_t);
+                                                                  first_entry_t, last_entry_t, options);
                 }
                 freez(region_info_array);
             }
             return rrd2rrdr_fixedstep(st, points_requested, after_requested, before_requested, group_method,
                                       resampling_time_requested, options, dimensions, rrd_update_every,
-                                      first_entry_t, last_entry_t, absolute_period_requested);
+                                      first_entry_t, last_entry_t, absolute_period_requested, context_param_list);
         } else {
             if (rrd_update_every != (uint16_t)max_interval) {
                 rrd_update_every = (uint16_t) max_interval;
                 /* recalculate query alignment */
                 absolute_period_requested = rrdr_convert_before_after_to_absolute(&after_requested, &before_requested,
                                                                                   rrd_update_every, first_entry_t,
-                                                                                  last_entry_t);
+                                                                                  last_entry_t, options);
             }
             return rrd2rrdr_variablestep(st, points_requested, after_requested, before_requested, group_method,
                                          resampling_time_requested, options, dimensions, rrd_update_every,
-                                         first_entry_t, last_entry_t, absolute_period_requested, region_info_array);
+                                         first_entry_t, last_entry_t, absolute_period_requested, region_info_array, context_param_list);
         }
     }
 #endif
     return rrd2rrdr_fixedstep(st, points_requested, after_requested, before_requested, group_method,
                               resampling_time_requested, options, dimensions,
-                              rrd_update_every, first_entry_t, last_entry_t, absolute_period_requested);
+                              rrd_update_every, first_entry_t, last_entry_t, absolute_period_requested, context_param_list);
 }
\ No newline at end of file
diff --git a/web/api/queries/rrdr.c b/web/api/queries/rrdr.c
index e727e607e..6cd0c0b14 100644
--- a/web/api/queries/rrdr.c
+++ b/web/api/queries/rrdr.c
@@ -98,7 +98,7 @@ inline void rrdr_free(RRDR *r)
     freez(r);
 }
 
-RRDR *rrdr_create(RRDSET *st, long n)
+RRDR *rrdr_create(struct rrdset *st, long n, struct context_param *context_param_list)
 {
     if(unlikely(!st)) {
         error("NULL value given!");
@@ -110,8 +110,16 @@ RRDR *rrdr_create(RRDSET *st, long n)
 
     rrdr_lock_rrdset(r);
 
+    RRDDIM *temp_rd =  context_param_list ? context_param_list->rd : NULL;
     RRDDIM *rd;
-    rrddim_foreach_read(rd, st) r->d++;
+    if (temp_rd) {
+        RRDDIM *t = temp_rd;
+        while (t) {
+            r->d++;
+            t = t->next;
+        }
+    } else
+        rrddim_foreach_read(rd, st) r->d++;
 
     r->n = n;
 
@@ -122,7 +130,7 @@ RRDR *rrdr_create(RRDSET *st, long n)
 
     // set the hidden flag on hidden dimensions
     int c;
-    for(c = 0, rd = st->dimensions ; rd ; c++, rd = rd->next) {
+    for(c = 0, rd = temp_rd?temp_rd:st->dimensions ; rd ; c++, rd = rd->next) {
         if(unlikely(rrddim_flag_check(rd, RRDDIM_FLAG_HIDDEN)))
             r->od[c] = RRDR_DIMENSION_HIDDEN;
         else
diff --git a/web/api/queries/rrdr.h b/web/api/queries/rrdr.h
index 6a031adf8..4d349c305 100644
--- a/web/api/queries/rrdr.h
+++ b/web/api/queries/rrdr.h
@@ -23,6 +23,7 @@ typedef enum rrdr_options {
     RRDR_OPTION_MATCH_IDS    = 0x00004000, // when filtering dimensions, match only IDs
     RRDR_OPTION_MATCH_NAMES  = 0x00008000, // when filtering dimensions, match only names
     RRDR_OPTION_CUSTOM_VARS  = 0x00010000, // when wraping response in a JSON, return custom variables in response
+    RRDR_OPTION_ALLOW_PAST   = 0x00020000, // The after parameter can extend in the past before the first entry
 } RRDR_OPTIONS;
 
 typedef enum rrdr_value_flag {
@@ -97,13 +98,17 @@ typedef struct rrdresult {
 
 #define rrdr_rows(r) ((r)->rows)
 
+#include "../../../database/rrd.h"
 extern void rrdr_free(RRDR *r);
-extern RRDR *rrdr_create(struct rrdset *st, long n);
+extern RRDR *rrdr_create(struct rrdset *st, long n, struct context_param *context_param_list);
 
 #include "../web_api_v1.h"
 #include "web/api/queries/query.h"
 
-extern RRDR *rrd2rrdr(RRDSET *st, long points_requested, long long after_requested, long long before_requested, RRDR_GROUPING group_method, long resampling_time_requested, RRDR_OPTIONS options, const char *dimensions);
+extern RRDR *rrd2rrdr(
+    RRDSET *st, long points_requested, long long after_requested, long long before_requested,
+    RRDR_GROUPING group_method, long resampling_time_requested, RRDR_OPTIONS options, const char *dimensions,
+    struct context_param *context_param_list);
 
 #include "query.h"
 
diff --git a/web/api/queries/ses/Makefile.in b/web/api/queries/ses/Makefile.in
deleted file mode 100644
index a82f2184d..000000000
--- a/web/api/queries/ses/Makefile.in
+++ /dev/null
@@ -1,519 +0,0 @@
-# Makefile.in generated by automake 1.15.1 from Makefile.am.
-# @configure_input@
-
-# Copyright (C) 1994-2017 Free Software Foundation, Inc.
-
-# This Makefile.in is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
-# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE.
-
-@SET_MAKE@
-
-# SPDX-License-Identifier: GPL-3.0-or-later
-
-VPATH = @srcdir@
-am__is_gnu_make = { \
-  if test -z '$(MAKELEVEL)'; then \
-    false; \
-  elif test -n '$(MAKE_HOST)'; then \
-    true; \
-  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
-    true; \
-  else \
-    false; \
-  fi; \
-}
-am__make_running_with_option = \
-  case $${target_option-} in \
-      ?) ;; \
-      *) echo "am__make_running_with_option: internal error: invalid" \
-              "target option '$${target_option-}' specified" >&2; \
-         exit 1;; \
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-  skip_next=no; \
-  strip_trailopt () \
-  { \
-    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
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-  for flg in $$sane_makeflags; do \
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-        -*I) strip_trailopt 'I'; skip_next=yes;; \
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-      *$$target_option*) has_opt=yes; break;; \
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-  test $$has_opt = yes
-am__make_dryrun = (target_option=n; $(am__make_running_with_option))
-am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
-pkgdatadir = $(datadir)/@PACKAGE@
-pkgincludedir = $(includedir)/@PACKAGE@
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diff --git a/web/api/queries/ses/README.md b/web/api/queries/ses/README.md
index 5f21c8494..c27970135 100644
--- a/web/api/queries/ses/README.md
+++ b/web/api/queries/ses/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Single (or Simple) Exponential Smoothing (`ses`)"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/ses/README.md
+-->
+
 # Single (or Simple) Exponential Smoothing (`ses`)
 
 > This query is also available as `ema` and `ewma`.
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 006041541..7cd7d62af 100644
--- a/web/api/queries/stddev/README.md
+++ b/web/api/queries/stddev/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "standard deviation (`stddev`)"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/stddev/README.md
+-->
+
 # standard deviation (`stddev`)
 
 The standard deviation is a measure that is used to quantify the amount of variation or dispersion
diff --git a/web/api/queries/stddev/stddev.c b/web/api/queries/stddev/stddev.c
index ad0efc838..16258445c 100644
--- a/web/api/queries/stddev/stddev.c
+++ b/web/api/queries/stddev/stddev.c
@@ -15,10 +15,8 @@ struct grouping_stddev {
 };
 
 void *grouping_create_stddev(RRDR *r) {
-    long entries = r->group;
-    if(entries < 0) entries = 0;
-
-    return callocz(1, sizeof(struct grouping_stddev) + entries * sizeof(LONG_DOUBLE));
+    UNUSED (r);
+    return callocz(1, sizeof(struct grouping_stddev));
 }
 
 // resets when switches dimensions
diff --git a/web/api/queries/sum/Makefile.in b/web/api/queries/sum/Makefile.in
deleted file mode 100644
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diff --git a/web/api/queries/sum/README.md b/web/api/queries/sum/README.md
index a7028ca66..aeace0a16 100644
--- a/web/api/queries/sum/README.md
+++ b/web/api/queries/sum/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Sum"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/sum/README.md
+-->
+
 # Sum
 
 This module sums all the values in the time-frame requested.