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#!/bin/bash
# Script to parse a text exposition format file into a unique list of metrics
# output by the exporter and then build lists of added/removed metrics.
old_src="$1"
if [ ! -d "$old_src" ] ; then
mkdir -p "$old_src"
fi
function generate_add_removed() {
type="$1"
pg_version="$2"
old_version="$3"
new_version="$4"
if [ ! -e "$old_version" ] ; then
touch "$old_version"
fi
comm -23 "$old_version" "$new_version" > ".metrics.${type}.${pg_version}.removed"
comm -13 "$old_version" "$new_version" > ".metrics.${type}.${pg_version}.added"
}
for raw_prom in $(echo .*.prom) ; do
# Get the type and version
type=$(echo "$raw_prom" | cut -d'.' -f3)
pg_version=$(echo "$raw_prom" | cut -d'.' -f4- | sed 's/\.prom$//g')
unique_file="${raw_prom}.unique"
old_unique_file="$old_src/$unique_file"
# Strip, sort and deduplicate the label names
grep -v '#' "$raw_prom" | \
rev | cut -d' ' -f2- | \
rev | cut -d'{' -f1 | \
sort | \
uniq > "$unique_file"
generate_add_removed "$type" "$pg_version" "$old_unique_file" "$unique_file"
done
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