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|
{
config,
lib,
this,
...
}:
with lib; let
cfg = config.nixfiles.modules.promtail;
in {
options.nixfiles.modules.promtail = {
enable = mkEnableOption "Promtail";
port = mkOption {
description = "Port.";
type = with types; port;
default = 30181;
};
loki.url = mkOption {
description = "Address of a listening Loki service.";
type = with types; str;
default = "https://${config.nixfiles.modules.loki.domain}";
};
filters = mkOption {
description = ''Filters to use with "scrape_config.pipeline_stages".'';
type = with types; listOf attrs;
default = [];
};
};
config = mkIf cfg.enable {
services.promtail = {
enable = true;
configuration = {
server = rec {
http_listen_address = this.wireguard.ipv4.address;
http_listen_port = cfg.port;
grpc_listen_address = this.wireguard.ipv4.address;
grpc_listen_port = http_listen_port + 1;
log_level = "warn";
};
clients = [
{
url = "${cfg.loki.url}/loki/api/v1/push";
batchwait = "30s";
batchsize = 100000;
external_labels.host_id = config.networking.hostId;
}
];
positions = {
filename = "/tmp/positions.yaml";
sync_period = "30s";
ignore_invalid_yaml = true;
};
scrape_configs = [
{
job_name = "journal";
journal.max_age = "24h";
relabel_configs =
map (n: let
label = toLower n;
in {
source_labels = ["__journal_${label}"];
target_label =
if hasPrefix "_" label
then substring 1 (stringLength label - 1) label
else label;
}) [
# Derived from systemd.journal fields[1].
#
# [1]: https://github.com/coreos/go-systemd/blob/main/sdjournal/journal.go#L335
# [1]: https://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html
"MESSAGE"
# "MESSAGE_ID"
"PRIORITY"
# "CODE_FILE"
# "CODE_LINE"
# "CODE_FUNC"
# "ERRNO"
"SYSLOG_FACILITY"
"SYSLOG_IDENTIFIER"
# "SYSLOG_PID"
# "_PID"
# "_UID"
# "_GID"
# "_COMM"
# "_EXE"
"_CMDLINE"
# "_CAP_EFFECTIVE"
# "_AUDIT_SESSION"
# "_AUDIT_LOGINUID"
# "_SYSTEMD_CGROUP"
# "_SYSTEMD_SESSION"
# "_SYSTEMD_UNIT"
# "_SYSTEMD_USER_UNIT"
# "_SYSTEMD_OWNER_UID"
# "_SYSTEMD_SLICE"
# "_SELINUX_CONTEXT"
# "_SOURCE_REALTIME_TIMESTAMP"
# "_BOOT_ID"
# "_MACHINE_ID"
"_HOSTNAME"
# "_TRANSPORT"
# "__CURSOR"
# "__REALTIME_TIMESTAMP"
# "__MONOTONIC_TIMESTAMP"
]
++ [
{
# This is weird. I can't find where is this defined in the
# source code but apparently it exists.
source_labels = ["__journal_priority_keyword"];
target_label = "level";
}
];
pipeline_stages = cfg.filters;
}
];
};
};
};
}
|
