Adding scrapeinterval to metric stops it being collected

[jasonhill-ds]

Have deployed exporter using Docker Compose and passed --scrape.interval=15s as below:

  exporter-oracle:
    image: container-registry.oracle.com/database/observability-exporter:1.5.2
    container_name: exporter-oracle
    command: '--scrape.interval=15s'
    ports:
      - 9161:9161
    restart: unless-stopped
    environment:
      - DB_USERNAME=****
      - DB_PASSWORD=****
      - DB_CONNECT_STRING=*****/****
      - CUSTOM_METRICS=/exporter/txeventq-metrics.toml,/exporter/more-txeventq-metrics.toml
    volumes:
      - ./exporter-oracle:/exporter
    networks:
      - monitoring

The container runs with the commandline arg set as expected:

bash-4.4# ps -ef
UID          PID    PPID  C STIME TTY          TIME CMD
1000           1       0  0 03:39 ?        00:00:00 /oracledb_exporter --scrape.interval=15s

Have metric in default-metrics.toml defined as below:

[[metric]]
context = "tablespace"
labels = [ "tablespace", "type" ]
metricsdesc = { bytes = "Generic counter metric of tablespaces bytes in Oracle.", max_bytes = "Generic counter metric of tablespaces max bytes in Oracle.", free = "Generic counter metric of tablespaces free bytes in Oracle.", used_percent = "Gauge metric showing as a percentage of how much of the tablespace has been used." }
request = '''
SELECT
    dt.tablespace_name as tablespace,
    dt.contents as type,
    dt.block_size * dtum.used_space as bytes,
    dt.block_size * dtum.tablespace_size as max_bytes,
    dt.block_size * (dtum.tablespace_size - dtum.used_space) as free,
    dtum.used_percent
FROM  dba_tablespace_usage_metrics dtum, dba_tablespaces dt
WHERE dtum.tablespace_name = dt.tablespace_name
and dt.contents != 'TEMPORARY'
union
SELECT
    dt.tablespace_name as tablespace,
    'TEMPORARY' as type,
    dt.tablespace_size - dt.free_space as bytes,
    dt.tablespace_size as max_bytes,
    dt.free_space as free,
    ((dt.tablespace_size - dt.free_space) / dt.tablespace_size)
FROM  dba_temp_free_space dt
order by tablespace
'''
scrapeinterval = "2m"

However, the tablespace metric never appears to get scraped. Other metrics without a scrapinterval set get scraped (on request) as expected.