bef9d401a4
tuwunel 1.9.4 exports no metrics. The host collector gets an httpcheck receiver on the gateway's /_matrix/client/versions (new services.hyperhive.otel.httpChecks, declared by hive-matrix), and a timer in the hive-matrix container pushes the database directory's size through the forwarder's OTLP port, as the attic cache-size unit does. The size step dereferences the state directory's symlink and pushes nothing for a result under 4096 bytes.
37 lines
1.6 KiB
Nix
37 lines
1.6 KiB
Nix
# The hive-matrix container's database-size step: measures a directory and
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# pushes the byte count as the gauge `hyperhive.matrix.database_bytes` to the
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# forwarder's OTLP/HTTP metrics receiver on loopback.
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#
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# `dir` is a `DynamicUser` unit's `/var/lib/<name>`, which systemd makes a
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# symlink to `/var/lib/private/<name>`. `--dereference-args` measures the
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# directory behind the link and works unchanged when `dir` is a real
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# directory; without it `du` reports the link itself (a few bytes).
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#
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# A result under 4096 bytes is not a database, since a directory entry alone
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# is that big: the step warns on stderr and pushes nothing, so the gauge
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# stays absent rather than wrong.
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#
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# Pure function — NOT a NixOS module. Needs `du`, `cut`, `date` and `curl`.
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{ lib }:
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{ dir, otlpPort }:
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''
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set -euo pipefail
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bytes="$(du --summarize --bytes --dereference-args ${lib.escapeShellArg dir} | cut -f1)"
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case "$bytes" in
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"" | *[!0-9]*)
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echo "du answered a non-number: bytes='$bytes'" >&2
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exit 1
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;;
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esac
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if [ "$bytes" -lt 4096 ]; then
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echo "warning: ${dir} measures $bytes bytes, too small for a database; pushing nothing" >&2
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exit 0
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fi
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printf '{"resourceMetrics":[{"resource":{"attributes":[{"key":"service.name","value":{"stringValue":"hive-matrix"}}]},"scopeMetrics":[{"metrics":[{"name":"hyperhive.matrix.database_bytes","gauge":{"dataPoints":[{"asInt":"%s","timeUnixNano":"%s"}]}}]}]}]}' \
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"$bytes" "$(date +%s%N)" |
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curl --fail --silent --show-error --max-time 20 \
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-H 'Content-Type: application/json' --data-binary @- \
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http://127.0.0.1:${toString otlpPort}/v1/metrics
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''
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