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Reduce default flush_threshold to 16MiB

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So that it doesn't cause `request body too large` errors when used with
the default OpenTelemetry Collector config that has `max_request_body_size`
set to `20MiB`.
This commit is contained in:
Yonas Habteab 2026-03-24 12:07:42 +01:00
parent 0718632f40
commit 3f68eea1fd
3 changed files with 12 additions and 3 deletions
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11
doc/09-object-types.md
View file

@ -1901,7 +1901,7 @@ There are more configuration options available as described in the table below.
| host\_resource\_attributes | Dictionary | **Optional.** Additional resource attributes to be included with host metrics. Defaults to none. |
| service\_resource\_attributes | Dictionary | **Optional.** Additional resource attributes to be included with service metrics. Defaults to none. |
| flush\_interval | Duration | **Optional.** How long to buffer data points before transferring to the OTLP backend. Defaults to `15s`. |
| flush\_threshold | Number | **Optional.** How many bytes to buffer before forcing a transfer to the OTLP backend. Defaults to `32MiB`. |
| flush\_threshold | Number | **Optional.** How many bytes to buffer before forcing a transfer to the OTLP backend. Defaults to `16MiB`. |
| enable\_ha | Boolean | **Optional.** Enable the high availability functionality. Has no effect in non-cluster setups. Defaults to `false`. |
| enable\_send\_thresholds | Boolean | **Optional.** Whether to stream warning, critical, minimum & maximum as separate metrics to the OTLP backend. Defaults to `false`. |
| diconnect\_timeout | Duration | **Optional.** Timeout to wait for any outstanding data to be flushed to the OTLP backend before disconnecting. Defaults to `10s`. |
@ -1911,6 +1911,15 @@ There are more configuration options available as described in the table below.
| tls\_cert\_file | String | **Optional.** Path to the client certificate to present to the OTLP backend for mutual verification. |
| tls\_key\_file | String | **Optional.** Path to the client certificate key. |
!!! tip
The `flush_threshold` is a byte size threshold, not a metric count threshold. By default, the writer will flush all
buffered metrics to the OTLP backend once the total size of buffered metrics exceeds 16 MiB. This number is chosen
based on the default `max_request_body_size` of the OpenTelemetry Collector, and you must adjust it according to the
`max_request_body_size` of your OTLP backend to avoid metrics being dropped due to exceeding the maximum request body
size. Furthermore, the writer may not flush at the exact byte size threshold due to the internal structure of OTLP
messages, so make sure that the threshold is lower than the configured `max_request_body_size` of your OTLP backend.
### PerfdataWriter <a id="objecttype-perfdatawriter"></a>
Writes check result performance data to a defined path using macro

2
etc/icinga2/features-available/otlpmetrics.conf
View file

@ -34,7 +34,7 @@ object OTLPMetricsWriter "otlp-metrics" {
# Please refer to the documentation for more details on each option.
// enable_ha = false
// flush_interval = 15s
// flush_threshold = 32*1024*1024
// flush_threshold = 16*1024*1024
# When stopping Icinga 2, this timeout defines how long to wait for any pending OTel
# metrics to be sent before disconnecting and discarding them.
// disconnect_timeout = 10s

2
lib/perfdata/otlpmetricswriter.ti
View file

@ -35,7 +35,7 @@ class OTLPMetricsWriter : ConfigObject
default {{{ return 15; }}}
};
[config] int64_t flush_threshold {
default {{{ return 32 * 1024 * 1024; }}}
default {{{ return 16 * 1024 * 1024; }}}
};
[config] bool enable_ha {
default {{{ return false; }}}