Turn off concurrent downloads by default

As concurrency and caching together is problematic, and might
lead to segfaults, turn off concurrent downloads by default.

Author: amotl

CHANGES.rst

@@ -6,6 +6,9 @@ grafana-wtf changelog
 in progress
 ===========
 - Started using ``versioningit`` for versioning
+- As concurrency and caching together is problematic, and might
+  lead to segfaults, turn off concurrent downloads by default.
+  Thank you, @glitchwizard.
 
 2025-02-04 0.22.0
 =================

README.rst

@@ -250,6 +250,11 @@ Watching out for recent editing activity on any dashboards?
     # Display 50 most recent changes across all dashboards.
     grafana-wtf log --number=50
 
+Concurrency
+===========
+
+Use the ``--concurrency`` option, for example ``--concurrency=5``, to enable
+concurrent downloading per ``ThreadPoolExecutor``.
 
 
 ********

grafana_wtf/commands.py

@@ -53,7 +53,7 @@ def run():
       --format=<format>                 Output format. One of textual, tabular, json, yaml.
       --cache-ttl=<cache-ttl>           Time-to-live for the request cache in seconds. [default: 3600]
       --drop-cache                      Drop cache before requesting resources
-      --concurrency=<concurrency>       Run multiple requests in parallel. [default: 5]
+      --concurrency=<concurrency>       Run multiple requests in parallel. [default: 0]
       --dry-run                         Dry-run mode for the `replace` subcommand.
       --verbose                         Enable verbose mode
       --version                         Show version information