diff options
Diffstat (limited to 'web/api/queries/min')
| -rw-r--r-- | web/api/queries/min/Makefile.am | 8 | ||||
| -rw-r--r-- | web/api/queries/min/README.md | 38 | ||||
| -rw-r--r-- | web/api/queries/min/min.c | 60 | ||||
| -rw-r--r-- | web/api/queries/min/min.h | 15 |
4 files changed, 121 insertions, 0 deletions
diff --git a/web/api/queries/min/Makefile.am b/web/api/queries/min/Makefile.am new file mode 100644 index 0000000..161784b --- /dev/null +++ b/web/api/queries/min/Makefile.am @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-3.0-or-later + +AUTOMAKE_OPTIONS = subdir-objects +MAINTAINERCLEANFILES = $(srcdir)/Makefile.in + +dist_noinst_DATA = \ + README.md \ + $(NULL) diff --git a/web/api/queries/min/README.md b/web/api/queries/min/README.md new file mode 100644 index 0000000..69ef4ea --- /dev/null +++ b/web/api/queries/min/README.md @@ -0,0 +1,38 @@ +<!-- +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. + +## how to use + +Use it in alarms like this: + +``` + alarm: my_alarm + on: my_chart +lookup: min -1m unaligned of my_dimension + warn: $this > 1000 +``` + +`min` does not change the units. For example, if the chart units is `requests/sec`, the result +will be again expressed in the same units. + +It can also be used in APIs and badges as `&group=min` in the URL. + +## Examples + +Examining last 1 minute `successful` web server responses: + +-  +-  +-  + +## References + +- <https://en.wikipedia.org/wiki/Sample_maximum_and_minimum>. + +[](<>) diff --git a/web/api/queries/min/min.c b/web/api/queries/min/min.c new file mode 100644 index 0000000..9bd7460 --- /dev/null +++ b/web/api/queries/min/min.c @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "min.h" + +// ---------------------------------------------------------------------------- +// min + +struct grouping_min { + calculated_number min; + size_t count; +}; + +void *grouping_create_min(RRDR *r) { + (void)r; + return callocz(1, sizeof(struct grouping_min)); +} + +// resets when switches dimensions +// so, clear everything to restart +void grouping_reset_min(RRDR *r) { + struct grouping_min *g = (struct grouping_min *)r->internal.grouping_data; + g->min = 0; + g->count = 0; +} + +void grouping_free_min(RRDR *r) { + freez(r->internal.grouping_data); + r->internal.grouping_data = NULL; +} + +void grouping_add_min(RRDR *r, calculated_number value) { + if(!isnan(value)) { + struct grouping_min *g = (struct grouping_min *)r->internal.grouping_data; + + if(!g->count || calculated_number_fabs(value) < calculated_number_fabs(g->min)) { + g->min = value; + g->count++; + } + } +} + +calculated_number grouping_flush_min(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) { + struct grouping_min *g = (struct grouping_min *)r->internal.grouping_data; + + calculated_number value; + + if(unlikely(!g->count)) { + value = 0.0; + *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY; + } + else { + value = g->min; + } + + g->min = 0.0; + g->count = 0; + + return value; +} + diff --git a/web/api/queries/min/min.h b/web/api/queries/min/min.h new file mode 100644 index 0000000..7470360 --- /dev/null +++ b/web/api/queries/min/min.h @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#ifndef NETDATA_API_QUERY_MIN_H +#define NETDATA_API_QUERY_MIN_H + +#include "../query.h" +#include "../rrdr.h" + +extern void *grouping_create_min(RRDR *r); +extern void grouping_reset_min(RRDR *r); +extern void grouping_free_min(RRDR *r); +extern void grouping_add_min(RRDR *r, calculated_number value); +extern calculated_number grouping_flush_min(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr); + +#endif //NETDATA_API_QUERY_MIN_H |