Update deprecated entries in promscale.conf

This configuration is installed when promscale is installed from the
package repository. Some of the environment variables used in it were
deprecated in a previous release.

Closes #1348

build/conf/promscale.conf

@@ -1,24 +1,18 @@
-# PROMSCALE_ASYNC_ACKS=""
-# PROMSCALE_DB_CONNECT_RETRIES=""
+# PROMSCALE_METRICS_ASYNC_ACKS=""
 # PROMSCALE_DB_CONNECTIONS_MAX="-1"
 # PROMSCALE_DB_HOST="localhost"
 # PROMSCALE_DB_NAME="timescale"
 # PROMSCALE_DB_PASSWORD=""
 # PROMSCALE_DB_PORT="5432"
 PROMSCALE_DB_SSL_MODE="prefer"
 # PROMSCALE_DB_USER="postgres"
-# PROMSCALE_DB_WRITER_CONNECTION_CONCURRENCY="4"
-# PROMSCALE_INSTALL_EXTENSIONS="true"
-# PROMSCALE_LABELS_CACHE_SIZE="10000"
-# PROMSCALE_LEADER_ELECTION_PG_ADVISORY_LOCK_ID=""
-# PROMSCALE_LEADER_ELECTION_PG_ADVISORY_LOCK_PROMETHEUS_TIMEOUT="-1ns"
-# PROMSCALE_LEADER_ELECTION_REST=""
-# PROMSCALE_LOG_FORMAT="logfmt"
-# PROMSCALE_METRICS_CACHE_SIZE="10000"
-# PROMSCALE_MIGRATE="true"
-# PROMSCALE_SCHEDULED_ELECTION_INTERVAL="5s"
-# PROMSCALE_TPUT_REPORT=""
-# PROMSCALE_USE_SCHEMA_VERSION_LEASE=""
+# PROMSCALE_DB_NUM_WRITER_CONNECTIONS="4"
+# PROMSCALE_STARTUP_INSTALL_EXTENSIONS="true"
+# PROMSCALE_METRICS_CACHE_LABELS_SIZE="10000"
+# PROMSCALE_TELEMETRY_LOG_FORMAT="logfmt"
+# PROMSCALE_METRICS_CACHE_METRICS_SIZE="10000"
+# PROMSCALE_TELEMETRY_LOG_THROUGHPUT_REPORT_INTERVAL=""
+# PROMSCALE_STARTUP_USE_SCHEMA_VERSION_LEASE=""
 # PROMSCALE_WEB_CORS_ORIGIN=".*"
 # PROMSCALE_WEB_LISTEN_ADDRESS=":9201"
 # PROMSCALE_WEB_TELEMETRY_PATH="/metrics"